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

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 equaled. No compromises for any 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
• Weight: 98 g
• Temperature: 8°C - 20°C / 46°F - 68°F