Made by LP Support, the Ankle Defender 3 provides supportive resistance against sudden twists or impact, dissipating the overloading forces during motions. To protect ankle from sprain & reduce symptoms of ankle sprain, the ankle brace is generally used by athletes to increase support & maintain the stability of the ankle during motion by adding pressure on the ankle joint to help prevent injury/re-injury. For maximum support or stability, this product is classed as professional level & aimed at those who suffer from acute ankle strain & sprains, ankle instability & recurrent ankle inkuries. Created from 45% PE, 30% neoprene rubber, 20% Coolprene (neoprene rubber) & 5% rubber, the breathable material offers an excellent moisture management system with an adjustable design that will fit most sizes. To find the perfect fit, measure the circumference just above the ankle bone. S: 15.6 ‒ 20.6cm M: 20.6 ‒ 25.7cm L: 25.7 ‒ 30.8cm XL: 30.8 ‒ 35.9cm