Skidless, no slip or non slip towels are all referring to the towels ability to stay put on top of a yoga mat. What makes skidless towels stay put? In the case of a company named yogitoes, their towels have little rubber dots on the bottom side of the towel that give the towel traction. Why do you need that? If you are just getting into yoga, you might have noticed that you can work up quite a sweat. The towel is there to absorb the moisture and keep it from getting onto the rubber mat. Obviously having a slippery mat is not a good idea when you are trying for an advanced yoga inversion asana. Upside down on a slippery mat can be dangerous. Other companies have their own version of making their Yoga Towels stay put. Yogitoes, currently has patents on their rubber dot technology. Other brands include Manduka eQua and Kalue. If you are planning on practicing Bikram Yoga, Hot Yoga or any other style of yoga that works up a sweat, a skidless yoga towel is standard equipment.