COREFX Dual Surface Gliders have layered felt for gliding on hard surfaces and detachable ABS plastic bases for gliding on Carpet. Work on your core strength with the gliders on your hands, knees or feet while performing a variety of exercises from push-ups to mountain-climbers. These gliders feature unique, textured foam cushion to provide traction and support. Keep the gliders together while traveling with a light, mesh carry-case.