Troy Lee Designs KG 5400 Knee Guard
Integrated Lycra low-compression zones in a strapless, tapered elastic sleeve with no-slip internal grip zones. Constructed with rugged woven Aramid material to resist abrasion.
Have ridden two seasons on these and they have held up well. They breathe fairly well and stay put, so after a while you don't even notice them. Be advised that all of the protection is right in front of the pad so it is possible to smack your knee if you hit your frame or stem. Good value and decent protection for a cross country rider but a little lacking for the gravity set.
These pads are very comfortable and very slim. Not bulky at all. Highly recommend.