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Balaclava made of Carbon Underwear®: it protects the neck and head, the most important parts of the body, which are particularly sensitive and extremely reactive to changes in temperature. On cold days, the patented SIXS Carbon Underwear® fabric eliminates body moisture and perspiration from the skin so that the sensation of cold is extremely reduced. Likewise on hot days – again exploiting the patented SIXS technology – it provides unrivaled comfort by preventing perspiration from building up. Racing look with "carbon dots" and visible logos.
Technologies:
- Antistatic system
- Hydrophobic weave
Composition:
77 % Polypropylene, 15 % Polyamide, 5 % Elastane, 3 % Carbon Fiber
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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.