45 feet of tubing are woven into the fabric of this launderable t-shirt. It is made from 100% breathable cotton. (It has gone through 25,000 commercial laundry cycles at Disney.) The shirt should be snug for optimal cooling benefits. We recommend order one size down form your normal shirt size. We suggest using our MPCS-ADD additive to keep the water that is in the shirt from growing bacteria. If the shirt is to be stored for more than 60 days you should drain it using our MPCS-UDK universal drain kit. Please specify shirt size (XXS-XXXL)