There are exactly as described. The material on the sides is thin, but it also is deep, so would easily fit a thicker mattres. I'm using it on a twin bed my granddaughter will be sleeping on.
I ordered two of these Mattress Protectors for our Twin XL beds. My husband put his between his sheets and the mattress pad because he likes the feel of the soft terrycloth on the protective rubbery fabric. I put mine on the Talalay mattress then the 100% cotton Mattress Pad. We both are comfortable. The protective part isn't crinkly like many of the mattress pads with protections.
I have been using this for my son's bed for a week and it is perfect for saving the matress from night time accidents. It washes easily. It doesn't have the loud plastic sound that most matress protector do. We have a normal thickness matress and the pad covers edge to edge and the sides are so large that they go well under the matress. I could easily see this working well for thicker mattresses or a mattress with a topper. Highly recommend for potty training kiddos.
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