These are available in three sizes for the arms. The Air Splint arm comes in a 370 x 420, 640 x 460 and 740 x 530 mm option for different people. The Air Splint leg comes in 420 x 370, 695 x 370 and 860 x 370 mm sizes for all types of patient sizes. These three different sizes are all made with sturdy nylon materials that are divided into six different compartments so you can select the right size as needed. Each model is used to support the limbs to keep them intact and to prevent them from moving in the event that there are serious injuries in the area, thus making this work right for anything that one wants to utilize.