The Neo G Airflow Knee Support with Multi Zone Compression provides a snug, yet flexible fit, helping warm muscles and support the knee during sporting and occupational activities. The specialist breathable fabric helps control moisture during intense activities whilst providing support during movement and the silicone top band feature is great a helping reduce slipping whilst on the move. The slimline, snug and dynamic design means it can easily be worn under everyday clothes at work, home or on the field for comfort, support and reassurance when you need it most. SIZING GUIDE - To size, measure knee circumference (cm) - Small: 30 - 34 cm; Medium: 34 - 38 cm; Large: 38 - 43 cm; X-Large: 43 - 48 cm.