Using a flatlock seam construction the Response from Gul has X-Flex super stretch panels for comfort and a seam free seat seam construction. The Response meets all the requirements for the all round water sports enthusiast. Product Information: Product Code: RE4313S20-BKBK Flatlock Seam Construction X-Flex 150% Super Stretch Main Body D-Flex Durable Lower Body Panels Thermospan Chest & Back 2 Way Front Zipper Relief System