KSO Heater shirts are 2mm thick built with comfort for all sizes.
My favorite time to be on the water is shortly after sunrise, long before the "monster boats" wake up ( no pun intended:>}) and start with the tubers, wakeboard and wakesurfers. The only down side in Michigan is that it can be pretty chilly. Today, July 4, 2017 it was 53 degrees F. The KSO HS13 Heater Shirt has been perfect for those mornings. It keeps me warm and does not restrict my motion for barefooting or slalom skiing. My only disappointment is that it is not made in the USA. That is big for me and the only reason I don't give it five stars. If I am completely honest, I liked the graphics and was hoping that it was made by Eagle.
Heater shirt fit well, per Ashleigh's size recommendation. Quality seems to be good and the shirt kept me much warmer than just my barefoot suit. It definitely will extend my skiing season. I also received the shirt very quickly via their free shipping.