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SIXS Functional suit STXL R black
(Product No.: MC-F33266-003-3XL/4XL)
One-piece undersuit SuperLight Carbon Underwear designed for the hot season, when suff ocati ng heat and humidity give no respite. In these conditi ons a garment is required that allows the athlete to retain the right body temperature by taking sweat (and heat along with it) to the outside without absorbing it. The result is a pleasant sensati on of dryness and freshness on the skin provided by our SuperLight Carbon Underwear® fabric (36% lighter than Carbon Underwear®), in additi on to making outerwear (one-piece leather suit, for example) easier to put on.
Composition: 74% Polypropylene, 16% Polyamide, 5% Elastane 5% Carbon
for women and men
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SIXS Size Chart
Fit-und-Warm carries SIXS mainly for functional shirts/base layers and socks. SIXS uses product-specific size charts for base layers and emphasizes body height as a particularly important selection measurement.
Socks – Current Crew Socks
| EU | US Men | US Women | UK | Foot range |
|---|---|---|---|---|
| 35–38 | 3.5–6 | 5–7.5 | 2.5–5 | 23–26 cm |
| 39–42 | 7–8.5 | 8.5–10 | 5.5–9 | 26–28 cm |
| 43–46 | 9–12 | 10.5–14 | 9.5–11 | 28.5–30 cm |
| 47–49 | 13–14.5 | 14.5–16 | over 11.5 | over 30.5 cm |
Older / Alternative SIXS Sock Labelling I–III
| SIXS | EU | US Men | US Women | UK | Foot range |
|---|---|---|---|---|---|
| I | 36–39 | 4–6.5 | 5–7.5 | 3–5.5 | 23–26 cm |
| II | 40–43 | 7–9.5 | 8–10.5 | 6–9 | 26.5–28.5 cm |
| III | 44–47 | 10–13 | 11–14 | 9.5–12 | over 29 cm |
Base Layers / Functional Shirts
| Product family | Official SIXS sizing logic |
|---|---|
| 4 Seasons / Light BT / Warm CU | Use the size chart directly on the product. |
| Most important measurement | According to SIXS, body height is particularly important. |
| Between sizes | Choose according to body height and product-specific fit. |
A universal numerical apparel master chart is deliberately not built from third-party data because SIXS itself uses a specific size chart per product.
Assortment check: Fit-und-Warm SIXS brand page. Manufacturer sources: official SIXS/SIX2 Crew Sock product pages and size-guide guidance for base layers. Research checked on 20 August 2026.