Novice and serious trekkershikersclimbers love CEP Trekking O2 Compression Socks. Experience an immediate increase in performance, boost in circulation, and unparalleled comfort with a decrease in fatigue, soreness, and blistering. Featuring a patented 12 16mmHg compression and sold per pair.CEP Trekking O2 Sportsocks maximize muscle oxygenation and boost energy with CEP's unparalleled scientifically optimized ultimate compression technology rated at 12 16mmHg for all day benefits.Less exertion Reduced fatigue Increased enduranceLess blistering Reduced muscle sorenessThe days of wearing socks solely to protect feet from blistering are over. CEP compression sportsocks are the first truly functional compression sport socks with a patented pressure flow technology that provide a scientifically proven increase in blood circulation and a consequent increase in performance. In addition to blister prevention, CEP socks provide more oxygen, more energy, an improved metabolization of lactic acid, and faster recovery.Sizing To determine your size, measure the circumference of the fullest part of your calf.