Nano Flex for the ultimate warmer: warm and comfortable in dry conditions, water repellent in damp conditions, and still warm in extreme conditions.

Product features

• Water-repellent thermal and breathable


• Nano Flex fabric


• Flat-lock stitching with single seam


• Double-sided silicone grippers to keep warmers in place

Technical Features

• Insulation: 3/5


• Waterproofness: 3/5


• Windproofness: 3/5


• Breathability: 4/5


• Lightness: 4/5

• Weight: 66gm


• Temperature: 8°C - 20°C / 46°F - 68°F


• Fit: Regular

NANO FLEX ALL-CONDITION WARMERS Choose Nano Flex for warmers that are great in dry conditions but also give some extra protection and warmth in wet conditions. We invented the category of water-protective thermal fabrics, and Castelli's proprietary Nano Flex is often imitated but never equalled. No compromises for any conditions.