The new AEROCROSS Self Layer has been specially developed for active people. The innovative bio-based COOLTH_SL fabric and Flowtunnels technology ensure excellent ventilation and maximum breathability. Whether you're running or training, the advanced properties of this outer layer will keep you cool and dry so you can perform at your best. Lightweight and durable, the Aerocross is a must-have for anyone looking for high-performance sportswear.
Fit-und-Warm carries UYN for Casual, MTB, Road Cycling, Running, Trekking and Winter Sports for women, men and children. Relevant products include base layers, T-shirts, jackets and socks. UYN uses strongly product- and activity-specific apparel fits.
Unisex / Men's Socks
EU
Foot length (cm)
US Men
UK
35–38
23–24
4–5.5
3–5
39–41
24.5–25.5
6.5–8
6–7.5
42–44
26–27
8.5–10
8–9.5
45–47
27.5–28.5
11–12.5
10.5–12
Women's Socks – On Models Labelled Accordingly
EU
Foot length (cm)
US Women
UK
35–36
22.5–23
4.5–5.5
3–3.5
37–38
23.5–24
6–7
4.5–5.5
39–40
24.5–25
7.5–8
6–6.5
41–42
25.5–26
9–10
7.5–8
Apparel
Area
Current official size selection
Men's technical apparel
XS to XXL; some products use combined sizes
Women's technical apparel
2XS to XXL; some products use XS/S, S/M, M/L, L/XL
Fits
Aerodynamic / Slim / Regular / Comfort
UYN provides the concrete size chart directly with each product. Because base layer, cycling, running, trekking and winter products use different constructions and fits, no third-party universal body chart is added.
Assortment check: Fit-und-Warm UYN brand page. Manufacturer sources: official UYN apparel categories/fit information and product-specific UYN sock size charts. Research checked on 20 August 2026.
