If you're taking on more challenging mountain bike trails and more gnarly terrain it's a good idea to pad up as taking a tumble can cut short a great ride if you're not protected. However, protection doesn't have to be inflexible and heavy, as you'll soon find out when you pull on the super-light and super flexible MT500 D3O Ghost Knee Protectors.  D3O® Ghost Insert The protection comes by the way of the D3O® Ghost Insert. This uses revolutionary new D3O® Impact Print™ technology to create the lightest and most flexible armour protection yet. Despite its lack of weight, you'll still benefit from the instant energy absorption of D3O in the event of an impact. And when you're pedalling the inherent flexibility comes into its own. Sweat-busting Comfort When you're working up a sweat on the trail you'll also be pleased to find the MT500 D3O protectors are remarkably good at dealing with moisture. Firstly the Ghost D3O insert itself allows perspiration to escape thanks to its open print design. Meanwhile, the stretch ripstop sleeve is quick to wick sweat off the skin and the open mesh backing allows your skin to breathe. Elastic cuffs hold the pads in place with silicone grippers ensuring a firm hold as you get rowdy.