If you practice any form of hot yoga or find you sweat a bit during your practice then a yoga mat towel is a perfect addition. These towels sit on top of your mat and absorb any excess sweat and increase your grip, leaving you to focus on the important stuff. Also if you use studio mats then these are a great way to put a protective hygienic layer between you and the mat. Light, portable, easy to wash ready for your next class.