I don't sew and have no desire to learn at this point in my life so we purchased one from Sullivans last year. Used it daily through out the summer. Left it in the freezer overnight, put in on the calves when we pulled them out of the cool barn and wet them down. I think it kept the callf chilled a little longer. I think it is a worthwhile product and we will be using it again this year. My son thought it was great. It's easy to use and relatively cheap.