Please enter the no. of feet you want to buy total. They come in 3' sections so you will get 3' sections plus a piece to complete your order. Ie if you buy 20' you will get 6 3' sections and a 2' piece to total 20'. Note pipe insulation is sold based on the pipe it will fit. Pipe is identified based on the ID of the pipe. For instance. 1" pipe is .84" OD, so the ID of the insulation for 1/2" pipe insulation is .84" and the OD will be 1.34" (1/2" wall on the insulation). This is general grade foam insulation that is a universal fit. If you want custom pipe insulation made to order, please contact us. 6' sections available but will cost extra for shipping because they are oversize.