Take care of your joints.
A warm knee is a happy, smoothly functioning knee, which is why GORE Bike Wear made the Knee Warmer III Thermo for your chilly rides. The weather can often hover in that, “A tiny bit too cold for shorts but too warm for tights,” stage, and that’s when these fleece-lined, thermo-stretch knee warmers come in handy. Pull on your shorts, slip into these GORE Bike Wear warmers, adjust the back hook-and-loop strap for a secure fit, and hop on your leg-powered steed.
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While they are a good, basic knee warmer and great weight, they don't stay in postion well unless you have shorts that will hold them securely in place.
How do i determine the right size for Gore...
How do i determine the right size for Gore Knee Warmers?
http://www.gorebikewear.co.uk/remote/Satellite/Men-Size-Chart?flag=1Gore does not provide sizing for its Knee Warmers. You should be able to make a generalization, based off the other dimensions on this chart. _______________________________________________________________________________________Most Men or Women 5'8" to 6'5" L/XLMost Women or Men (up to about 5'8) Sm/Md__________________________________________________________________________________If they are to small they will cut off the circulation, to large they will fall off.I hope tha this helps.