PeapodMats are 100% waterproof. There will be no leakage on to your bed sheets or mattress. No straps or velcro - grippy bottom allows it to stay in place. Lies on top of sheets - no tucking or wrapping around mattress corners. Lays flat without bunching - provides protection and comfort all night. Lasts +500 washes.  Great for traveling, nursing moms, incontinence, chair protector for messy meals, & more!