The Vulkan Stabilising Knee support helps provide stability around the knee.... The compression strap provides added support and stability.... It also features spiral stays for greater support.... Recommended for thouse who experience a feeling of instability around the knee but who wish to participate in sports activities like skiing or snowboarding, or those who have a particulary stressful occupation involving lifting/kneeling.... Compression straps provide added support and stability.... Measure around mid-section of the knee while in a standing position.... S=30-35cm... M=35-40cm... L=40-45cm... XL=45-50cm... ...Products in the Vulkan support range are of slightly higher quality than in the LP support range, hence the difference in price…