I teach swim lessons or coach swim team almost every day and want a neoprene shirt to help keep me warm. I thought this shirt was a good idea. It feels well and keep my core warm. However, it has been less than 3 weeks since I purchased it and the nylon in the sleeves and on the side have already worn out and little bits of white are coming off onto everything. I hand washed the shirt everyday after I wore it. I was considering purchases them for my entire swim lesson staff but not if I have to replace it every month.