It is made with Dryarn Polypropylene and carbon yarn which have been combined to achieve un excellent synergy. The slight compression makes this underwear a key garment for winter months.FeaturesFor all cyclists wanting to get out whatever the weatherBreathable fabric that retains heat and wicks away moisture on the bodyStretchy material to adhere to the body well for maximum comfort without constraintRegulates temperature perfectly to keep riders at the ideal temperatureAles size guide can be found here: https://aleclothing.com/sizeguideDetails and Materials:Recommended temperature: -4/4 DegreesMain fabric composition: 80% polypropylene, 10% polyamide, 5% elastane, 5% carbon fiberCare Instructions:Washing machine at 30 degreesDo not use bleachDo not dry clean/ iron/ tumble dryWash similar colours together