As close to custom as you can get, the starlight whisper for twins and fulls gives you all of the benefits of their Starlight Supreme with the addition of a you choose sleep surface. The you choose sleep surface gives you the same fantastic, child cool visco foam core on both sides, but wraps each side in a different premium fabric. On side one is our breathable, deluxe, organic cotton cover for older children who are looking for a plush sleep surface. Side two is covered with our premium SoftSleep waterproof knit and is ideal for younger children who are just transitioning to a youth mattress or who may still be potty training. Starlight Whisper lets you decide what your child needs as they need it. This mattress comes with BabyCool visco foam, oxyflo designed, on both sides of the mattress. It features SafeSewn seams, a posh fabric cover choice on each side, and a mineral derived woven fire barrier (no harsh chemicals). Every starlight whisper mattress takes protecting baby one step further with an engineered BreatheWell core specially designed to circulate air throughout the mattress.