Excellent quality, the material is very dense, firmly glued, in a pumped state there is nothing to be sold under the feet and the surface of the mat is made very well and comfortable, it will not slide exactly, in the back of the mat there is not a big lift-stop for the foot. The size is optimal. Optional 5 rigging rings fastening. The inflation valve is thought out, does not let in at all. Seller before shipping all checks. All questions will be answered quickly! I advise you. The only thing, but it's our customs, which kept the parcel in their warehouses for 10 days. Otherwise everything is fine!