$17.00 per pair Buy 12 or more pairs and get $1.75 off each pair and free shipping,*applied at checkout when selecting quantity Regarding Sizing - measure the circumference of area just above your knee.  Circumference is 12"-13-1/2" - Size Medium (formally marked Size Small)Circumference is 14" and above - Size Large (formally marked Size Med/Large) The Black Knee Pads style is a more contoured fitting knee pad, wider at the top, narrow at the bottom. Sizing for the black ones runs on the smaller size. The Natural Knee Pads are tube like, same width at the top and bottom with a more stretchy banding. These come in one size which fits most adults. Circumference just above the knee should be at least 13". Between the two, the black has a more stylish fit and look, but the natural felt ones are a little more comfortable if you plan to wear them 4 or more hours at a time. Please let us know if you have additional questions. See Natural Kneepads