The tennis elbow strap has a wide variable tension strap that assists in the relief of pain caused by inflamed tendons and offers support to the elbow joint by reducing stress on impact. It also has a soft, comfortable neoprene sleeve. 

SIZES (Measure around the centre of the forearm when extended):-

Small: 23cm - 26cm
Medium: 27cm - 30cm
Large: 31cm - 35cm
X-Large: 36cm - 40cm