The Patagonia Capilene Thermal Weight base layers are some of the warmest base layers out there. Don't get cold out there this winter, the Capilene TW base layers will take the edge off. They boast an incredible amount of warmth due to the lofted Polartec Power Grid fabric, by trapping that extra air right next to skin, these base layers keep you more toasty than even the best quality merino. The open-grid style of construction gives these base layers an incredible ability to breathe and keep sweat away from your skin, ultimately keeping you even warmer! Nothing compares to the odour control of merino base layers, but after being treated with the HeiQ anti-odour treatment these 100% synthetic thermals do a good job of keeping you stench free. Features Polartec® Power Grid® fabric with HeiQ® Fresh durable odour control has a smooth face for easy layering Fabric’s open-grid pattern next to skin provides superior warmth, breathability and moisture-wicking performance Spandex for stretch and ease of movement Flat waistband has brushed inner elastic for next-to-skin softness Gusseted crotch for comfort and unimpeded mobility Flatlock seams to minimize chafing 139 g (4.9 oz) Patagonia Womens Capilene Thermal Weight Bottoms