GREAT product, great price
There's just one little spike missing at the bottom of the mat but I think it's part of the design. Apart from that, the neck pillow is great and I have used it under my knees as well and under my legs. It works great. The mat itself is wonderful. I feel warm on my back after laying on it for 10 minutes without any clothing in between to get maximum effect. I can definitely feel the increased circulation that comes with it and I use it almost daily in between my foam rolling and red light therapy. Great addition to add in your routine that can be used everyday!