I have been trying out the Sweaty Betty Eco yoga mat for a week or so. It feels like complete luxury compared to my other mats. It is quite thick and is made from recyclable non-toxic plastic. It it is embossed on both sides to prevent slipping.
It is a perfect mat for a a home yoga practice and is fantastic for anyone who has kneeling issues. However, I personally found it a little bulky to carry to class with me and the strap slightly is fiddly. That said, it is the Rolls Royce of yoga mats in terms of comfort.