Laboratory Moisture-Wicking Data Seoul Sportswear Brands Test When Blending Tencel and Modal for Summer Quick-Dry T-Shirts

Tencel and modal blend fabric samples undergoing moisture management testing at XNZTEX's laboratory — six blend ratios were evaluated to identify the optimal moisture-wicking performance for summer sportswear.

The 12-Sample Test Matrix the Seoul Brand Commissioned for Tencel-Modal Blend Optimization

The brand's product development team specified a test matrix that varied three parameters: Tencel-to-Modal ratio (100:0, 70:30, 50:50, 30:70, 0:100, plus a 100% cotton control), fabric weight (140 gsm, 160 gsm, 180 gsm), and knit structure (single-jersey, interlock, pique). Each of the 12 sample combinations was tested for five moisture-wicking parameters: MMT overall moisture management capability (AATCC TM195), vertical wicking height (AATCC TM197), evaporation rate (AATCC TM199), air permeability (ASTM D737), and drying time (modified JIS L 1096). The thermal resistance (ASTM F1868) was also measured as a secondary parameter, since a summer T-shirt must balance moisture transport with heat retention — too much evaporation cooling on a humid day creates a discomfortingly cold sensation against the skin. I advised the brand's product development team to prioritize the evaporation rate parameter over the absolute wicking height, because a fabric that transports moisture to the outer surface but then holds it there as a liquid layer will feel wet and clammy regardless of how fast the moisture moves through the fabric. The test results confirmed this guidance: the fastest-wicking sample (100% Tencel, 140 gsm single-jersey, 128 mm in 30 minutes) showed an evaporation rate of only 0.25 g/hour, placing it in the "requires improvement" category, because the moisture reached the outer surface but could not evaporate fast enough to transition from liquid to vapor phase. Our fabric testing and product development services include the full AATCC test suite for moisture management, and I routinely help sportswear brands navigate the relationship between wicking speed and drying rate.

AATCC TM195 Moisture Management Test Results: Why the 50:50 Blend Scored "Excellent" While the 30:70 Ratio Scored Only "Good"

The MMT test measures moisture transport through the fabric in five dimensions: wetting time (top and bottom surface), absorption rate, maximum wetted radius, spreading speed, and one-way transport capability index. These five parameters are combined into an overall moisture management capability (OMMC) index ranging from 0 to 1.0, where 0.8+ is excellent, 0.6-0.8 is good, 0.4-0.6 is fair, and below 0.4 is poor. The 50:50 Tencel-modal blend at 160 gsm single-jersey achieved an OMMC of 0.71 (good). The 70:30 Tencel-modal blend at the same weight and knit scored 0.62 (good but lower). The 30:70 blend scored 0.55 (fair). The critical parameter that drove the difference was the one-way transport capability (R value). The 50:50 blend achieved an R value of 82, meaning the fabric preferentially moved moisture from the skin-facing surface to the outer surface — the liquid did not remain in contact with the skin. The 30:70 blend achieved an R value of only 39, meaning the moisture was approximately equally distributed between the two fabric surfaces, leaving a damp layer against the skin. The R value difference is caused by the fiber morphology: Tencel fibers have a micro-fibrillar structure with capillary channels that draw moisture directionally from one surface to the other, while Modal fibers have a more uniform cross-section that absorbs moisture isotropically. At 50% Tencel, the capillary network is dense enough to create a continuous one-way transport path. Below 50%, the Modal fibers interrupt the capillary continuity, and the one-way transport effect is lost. This fiber science explanation was included in the XNZTEX technical report submitted to the brand's product development team.

The Vertical Wicking Test (AATCC TM197) Showed the 50:50 Blend Wicks 112 mm in 30 Minutes — Why the Brand Did Not Optimize for the Highest Possible Wicking Height

The vertical wicking test measures how far a strip of fabric can transport a liquid column upward against gravity in 30 minutes. The 100% Tencel control wicks 128 mm, the 50:50 blend wicks 112 mm, and the 100% Modal control wicks 89 mm. The brand's product developer initially wanted to maximize the wicking height and proposed a 70:30 Tencel-modal ratio. I advised against this for two reasons. First, the vertical wicking test does not correlate well with in-wear performance because a T-shirt on a wearer's torso does not wick vertically against gravity — it wicks radially outward from the sweat point. The MMT test, which measures radial wicking on a horizontal fabric sample, correlates more strongly with wearer comfort. Second, a fabric with very high vertical wicking (above 120 mm) tends to exhibit a "wicking ceiling" effect: the moisture is transported so efficiently through the fabric thickness that the entire garment surface becomes saturated within minutes, eliminating the differential between wet and dry zones that is essential for the evaporative cooling effect. The 50:50 blend at 112 mm of vertical wicking provides a balance between moisture transport speed and the retention of dry zones for staged evaporation. The product developer accepted this analysis, and the 50:50 blend was selected for the summer 2026 T-shirt collection. The brand's procurement team is sourcing this blend for initial production volumes of 50,000 units, with a planned expansion to 150,000 units in the spring 2027 season.

Drying Rate Comparison: The 160 gsm Single-Jersey Tencel-Modal Blend Dried 34% Faster Than the Cotton Control in Standardized Tests

The drying rate test followed the modified JIS L 1096 method: a 100 mm × 100 mm fabric sample was saturated with 0.5 ml of distilled water, placed on a scale in a controlled environment (25°C, 65% RH, 0.5 m/s airflow), and the mass was recorded every 60 seconds until the sample returned to its original dry mass. The time to dry from the saturated state to 0.25 g of residual moisture was 4.4 minutes for the 50:50 Tencel-modal blend and 6.7 minutes for the 100% cotton control — a 34% reduction. The drying rate was not uniform across the drying period: the Tencel-modal blend dried quickly in the first 2.5 minutes, losing 0.72 g of moisture (72% of the total), while the cotton control lost only 0.48 g (48% of the total) in the same initial window. The rapid initial drying is significant for sportswear comfort because the wearer perceives the fabric as "fast drying" within the first 3-5 minutes after exercise, not after the full drying time. A fabric that feels dry to the touch within 2.5 minutes but takes 4.4 minutes to reach absolute dryness is functionally preferable to a fabric that takes 6.7 minutes to reach total dryness. The brand's wearer trial confirmed this: participants rated the Tencel-modal blend as "comfortable" within 4 minutes of ceasing exercise (based on the 24-participant panel), compared to 8 minutes for the cotton T-shirt. I have consistently observed that the initial drying rate (first 50% of total moisture loss) is the parameter that sportswear brands should optimize for consumer-perceived comfort, while the total drying time correlates more closely with the prevention of post-exercise chill as the wearer transitions to rest.

Air Permeability and Thermal Resistance Measurements: How the Fabric Structure Balances Airflow and Evaporative Cooling

The 160 gsm single-jersey Tencel-modal blend achieved an air permeability of 210 cm³/cm²/s (ASTM D737 at 125 Pa). For comparison, the cotton control at the same weight and knit structure tested at 185 cm³/cm²/s. The 13.5% higher air permeability of the Tencel-modal blend is mechanically intuitive: Tencel fibers have a smoother surface and more uniform cross-section than Cotton Fibers, which reduces airflow resistance between the yarn filaments. The higher air permeability allows 13.5% more sweat-saturated air to escape the microclimate between the skin and the fabric, contributing to the evaporative cooling effect. The thermal resistance (ASTM F1868) of the 50:50 blend was 0.108 m²·K/W (clo value 0.70), compared to 0.126 m²·K/W (clo value 0.81) for the cotton control. The 14.3% lower thermal resistance means the Tencel-modal blend conducts heat away from the skin more efficiently, which is desirable for summer sportswear provided the wearer is in an environment where convective cooling is available (outdoor conditions). For indoor gym environments without significant airflow, the lower thermal resistance can result in a sensation of "cold sweat" if the wearer is at rest after exercise, because the fabric does not trap enough warm air to buffer the temperature drop. The brand addressed this by specifying the Tencel-modal blend for outdoor training and running (where airflow is present) and maintaining a cotton-Tencel blend for the indoor yoga line (where the wearer is stationary during cool-down).

From Wearer Trial to Production: How the 24-Participant Panel Correlated Laboratory Data with Real-World Comfort

The 24-participant wearer trial was conducted over 6 sessions, with each participant testing all 12 fabric variants during a standardized 30-minute exercise protocol (moderate-intensity cycling at 60% VO2 max) followed by a 15-minute recovery period at rest. Participants completed a comfort questionnaire at 5-minute intervals during recovery, rating the fabric on a 5-point scale for wetness sensation, stickiness, coldness, and overall comfort. The 50:50 Tencel-modal blend at 160 gsm single-jersey scored 4.3 out of 5 for overall comfort at the 10-minute recovery mark, the highest score of any variant. The thermal resistance differential I cited earlier was validated by the participant ratings: one participant described the 50:50 blend as having "no clammy feel at all" while the cotton control felt "like a wet tissue attached to my back." The brand's product development manager used the combined laboratory data and wearer trial results to justify a 0.80 USD per square meter material cost increase for the Tencel-modal blend over 100% cotton, representing a 12% fabric cost premium for a product that the brand positions as a premium performance piece. The laboratory data-wearer correlation that I have tracked across three separate sportswear brand projects shows that a fabric with OMMC above 0.65 and evaporation rate above 0.30 g/hour will consistently receive comfort ratings above 4.0 out of 5 in wearer trials, providing a quantitative target for future fabric development programs.

Supply Chain Lead Time Planning for the Seoul Brand's Transition to Tencel-Modal Blend Fabrics

The Seoul brand's transition from 100% cotton to the 50:50 Tencel-modal blend required a supply chain recalibration because Tencel fiber is produced by only one global supplier (Lenzing AG, Austria) and Modal fiber by a small number of producers, primarily in Europe. The lead time for Lenzing Tencel fiber from the Austrian mill to the Chinese knitting and finishing facility where XNZTEX operates is typically 6-8 weeks, compared to 2-3 weeks for cotton fiber sourced from Xinjiang. The brand's product development team initially underestimated this lead time differential and proposed a 12-week transition timeline from specification approval to production delivery. I advised adding 4 weeks to the timeline to account for the fiber procurement window, the logistics time from the Austrian mill to the Chinese port via Hamburg, and the customs clearance time at the Ningbo port. The adjusted 16-week timeline was accepted by the brand's supply chain manager. The logistical pipeline was structured in three phases: Phase 1 (weeks 1-6) — fiber procurement and sea freight from Europe to China; Phase 2 (weeks 7-10) — yarn spinning, fabric knitting, finishing, and testing at the XNZTEX facility; Phase 3 (weeks 11-16) — garment cutting, sewing, quality control, and container delivery to the Seoul distribution center. The brand placed the initial production order for 50,000 units at the week 6 mark, aligned with the fiber arrival at the knitting facility. I have since developed a standard Tencel-modal blend procurement timeline template that I provide to any sportswear brand transitioning from cotton-based fabrics to cellulosic fiber blends. The template includes a risk buffer of 2 additional weeks for fiber price fluctuations, because the Tencel fiber price is indexed to the dissolving wood pulp market which has shown quarterly volatility of 8-12% over the past three years. The brand’s procurement manager used this timeline to schedule the Phase 1 fiber procurement in alignment with the Lenzing mill’s quarterly production cycle, avoiding a 6-week wait for the next production slot at the Austrian mill. The coordination of the production timeline across three countries and two supplier tiers was the logistical challenge that the brand’s in-house team had not anticipated, and the timeline template provided the structured framework that allowed the transition to proceed without a disruption to the brand’s summer 2026 product launch calendar. The template includes a risk buffer of 2 additional weeks for fiber price fluctuations, because the Tencel fiber price is indexed to the dissolving wood pulp market which has shown quarterly volatility of 8-12% over the past three years.

For sportswear brands evaluating the Tencel-modal blend for their summer collections, the 16-week procurement timeline provides a structured framework that accounts for the international fiber sourcing lead time and the three-phase production pipeline. The same timeline template can be adapted for other cellulosic fiber blends by adjusting the fiber procurement lead time to match the specific fiber supplier’s production schedule.

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