The core shorts are a neoprene jammer designed to simulate the lift of a wetsuit by using the same top of the line materials as blueseventys award winning helix resulting in a seamless adjustment to swimming on race day it is durable and designed to withstand hours of pool and open water use made to improve distance per stroke speed and body position all without the bulk and drag of a pull buoy they should be worn over a swim suit and used for specific sets when looking to take advantage o