Introducing the 2XU VECTR sock with X-LOCK compression technology. Powerful compression support locks the foot in place to improve stabilization and optimize movement across a range of activities. Sizing is unisex. Please refer to the size guide Product Details Proprioceptive ankle and arch stabilization Improved coordination Promote circulation in the foot X-LOCK supports plantar fascia, arch and ankle to optimize footstrike and push-off. Blister prevention design. Ergonomic left/right foot improves fit and comfort. Light cushioning to support forefoot impact, push-off, and heel impact without the bulk. Anti-abrasion seamless toe construction for comfort. Mesh panel for ventilation. Permanent antibacterial and anti-odour. Fabric Benefits NYLON - Lightweight. Breathable. Durable. Fit (mmHg): 15-20* at base of foot Fabric: 88% Nylon / 12% (Invista LYCRA®)