dhb Winter Sock: Heavyweight winter cycling sock, with Thermolite polyester fibers aimed to keep you as warm as possible, in crisp cold conditions. Our thickest sock for cold rides. Exceptional warmth on the front facing panels, Thermolite fibers trap air & insulate. Volumised heel. Reinforced toe & heel. Fibers have been manufactured with softener to give a comfort feel. Thermolite fibre Ribbed front construction Extra warm upper Reinforced heel Reinforced toe Arch support zone Volumised Y heel