1. Look for little holes that have formed from regular wear & tear. Once this happens, the mat will shed and you will not get proper cushion.
2. Smell it (awkward) and if it doesn’t smell too great, that’s the perfect reason to throw it out.
If you’re the kind of person who doesn’t like wasting things, you can always wash & reuse your old yoga mat! Check out this post on 50 ways to reuse your mat –> http://www.apartmenttherapy.com/50-ways-to-reuse-your-yoga-mat-86618
Check out our yoga mats at http://www.matdepot.com!