The Core Swim Short by Blueseventy simulates the lift of a wetsuit to help improve your stroke and body position. The bright orange graphics on the sides of the hips also make it easier for a coach or another swimmer to see and correct hip positioning from the pool deck. Buy This Suit If: You want to be faster and more efficient in the pool without wearing a wetsuit. Neoprene Composition Crotch: 5mm Yamamoto SCS coated super buoyant neoprene. Buttocks: 5mm Yamamoto SCS coated Neoprene. Thighs:3mm Yamamoto SCS coated neoprene with extra stretchy A-Flex jersey liner. Features High quality jersey liner. Thinner side panels: Promote rotation. Bright Orange Graphics on hips: Make it easier for a coach to see and correct hip positioning from pool deck. SCS coating: Makes the short durable and hydrophobic. Longer length provides additional buoyancy. Higher cut back: Limits the water entry. Drawstring at waist: Ensures a secure fit. Note: The core short should be rinsed inside out with fresh water after each use and hung to dry.