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Arm / Leg

$94.99
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. - Water-repellent thermal and breathable Nano Flex fabric - Flat-lock stitching with single seam - Double-sided silicone grippers to keep warmers in place - 8°-18°C / 46°-64°F - Weight: 119g
$64.95
Nano Flex for the ultimate warmer: warm and comfortable in dry conditions, water repellent in damp conditions, and still warm in extreme conditions. Choose Nano Flex for warmers that are great in dry conditions but also give some extra protection and warmth in wet conditions. Castelli 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.
$74.95
- Thermoflex fleece fabric is warm, stretchy and soft - Single-piece construction with flat-lock seams - Embossed Castelli wordmark logos - Dual-sided silicone gripper elastic at top prevents sliding down
$49.99
You can officially only rate these warmers at UPF 50+, but in the laboratory tests they actually blocked 99.8 percent of damaging UV rays. Castelli used a polyester base that is not only more effective than nylon at blocking UV rays but is also much better at keeping you dry, which means these arm sleeves are better in both cooler and warmer conditions. Castelli kept the construction very clean to eliminate seams that can rub, and used the double-sided silicone elastic to make sure they stay in place. They fold up extremely small, so they’re great to stick in your pockets for your next big mountain day.
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