5mm hex socket - nominal 8mm outer diameter

They feature an internal silicone elastic webbing to keep them in place

as a result

Boa’s patented system consists of three integral parts: a micro-adjustable dial

POC Joint VPD Air Elbow Pads - XL - Obsydian Brown Out of Stock 5mm hex socket - nominalOffering the ultimate in enhanced flexibility, ventilation, and freedom of movement, the Joint VPD Air is a light duty elbow pads that is so comfy that you'll actually want to wear it. Who's this item for: Anyone looking for elbow protection that they'll actually want to wear and not just leave in the car every time. Protection Style: Lightweight and pliable protection that hardens up under impact. Materials: Neoprene and lightweight reinforced