The Ocean Hunter 1.5mm Soft Fin Socks can be used with closed foot fins for greater warmth and to protect the skin from scratches and chafing, as well as with firm-soled boots, using open-heel fins, also for extra warmth. In this case, warmth is considerably increased and it is also easier to put on your wetsuit boots as we all know how hard that can be. These are one of the most comfortable socks on the market today due to the seams being where a normal socks seams are so there fore being extremely comfortable. The strecthyness allows ease of putting on and taking off. The 1.5mm Soft fin socks are a must have when purchasing closed heel fins as they make everything more comfortable.