Have had these for about 50 or so dives and they are going strong. High quality, extremely warm, and very comfortable coupled with their neutral buoyancy -- can't go wrong with lavacore. I use them as a rash guard under my wet suit and I can feel the difference in warmth under that area of my core when diving. I have used them in the ocean coupled with the lava core shorts as well and has kept me completely comfortable in just lava core shirt/shorts down to lower 70's in the ocean. Fit for me personally was very off (ran very small compared to what was listed needed two sizes up from what was listed). rinse after every use and have not contracted an odor at all.