The Knox Action Pro elbow sleeve is made from DuPont Sorona Agile fabric, which is an eco-efficient part made with plant-based polymers. It offers high levels of stretch and strength with stretch mesh on the back for high levels of breathability with a soft silicone grip at the top and bottom to ensure it stays in place. The hybrid stretch is suitable for all types of riding and gives superior freedom of movement. One size fits all, and these are unisex. These also feature a 5-year guarantee on Micro-Lock protectors when registered with the manufacturer.