Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Look for warmers that have silicone grippers on both sides of the hem. One to grip your thigh; the other the grip the inside of your shorts. I've had LG and Castelli knee warmers like this: never a problem. I've also had cheap Nashbar warmers that only had one way grippers; those weren't as good at staying in place.