1. Leak proof: There is a thin plastic layer which makes it waterproof. Tried and tested. 2. Perfect fit: bought for king and queen sizes, it fits perfectly. 3. Static : biggest benefit is that the bedsheet placed on top will not move after using overnight. It saves lot of time for me, I dont have to spread and arrange the bedsheet every morning. Surprised to see this effect.
Recommendations : please have more colors and varieties that covers bottom side as well.