Functional ValueInner lining - Carbon Graphene 0 15 internal lining in the core body area Innovative new graphene coated yarns trap and retain heat more efficiently for longer making it incredibly warm, knitted to allow the material to stretch and reduce water absorption and dry super-fast Thermo Silk in the arms and lower legs for increased warmth and flexibility Foam - Superlight foam, lightweight, high stretch with great thermal retentionOuter material â Durable high stretch materialSplittoe designVulcanized durable sole design with arch secure shaping