I am not sure what Tikki is, but it is not something where you need to be a member. The clothes are great quality as it's all I do yoga in right now, and also with the 20% off you can get pretty good prices for the quality. I am personally very weird when it comes to material and theirs to me is absolutely fantastic I could wear it all day. The yoga shorts actually stay on and don't ride up, it's great! Plus it's helping two great causes. So to me, win x3, which is why I'm working so hard to promote!