I ordered these tights after hearing my friend rave about Virus tights. I wasn’t sure what size to get and ordered a Small after looking at the sizing guide. Once the tights came in I immediately thought I would need to exchange for a Medium, but these stretch! I did not hear any pulling or tearing sounds while putting them on so that was a great sign. I did some cardio on the Stairmaster to see if the cooling technology was true and I was surprised on how cool I stayed. Rhere are no seams at the fold of the buttox which is also a huge plus since other compression tights I have tried had their seams there which makes the stairmaster and squatting uncomfortable. Over all 10/10 would recommend and can't wait to try so more products!