[This review was collected as part of a promotion.] You can definitely tell this is a waterproof pillow case, as it makes the typical windbreaker/nylon swooshing sound when you rub your hand across the fabric. However, a tight fitted sham over it really helps to reduce the loud noise. If the waterproof feature wasn't your highest priority when looking for pillow cases, not sure these would be worth it. The zipper is sewn well with a smooth track, but I wish it had a 'hideaway' pocket to tuck it in/conceal it to prevent it from making contact against a hard headboard. Again, a pillow sham should fix this. Fabric is smooth and cool to the touch, feels like thick, durable, polyester. Like slinky dress pants. I wasn't in love with these cases, but it's hard to say that I wouldn't compromise on these cons if I really need to rely on the waterproof aspect.