I bought a half dozen or so shirts from Michaels located right under the Tulip dye when they were on sale around Memorial day. I dyed some with Tulip and I was disappointed because I did not think the colors were vibrant. I even posted on this site questioning whether Jerzees were good for dying. When I was tying up for the big tie dye last week I noticed that the shirts were 50 50 not 100 percent cotton. No wonder the colors were not so vibrant. I never thought to check since the shirts were right by the dyes. I noticed the same thing at Walmart last weekend. The shirts by the dye were 50 50 not 100 cotton. I assumed incorrectly that the best tie dye shirts would be located by the dyes. I have since bought the multi packs of all cotton and for me I can see the difference. I just thought I would pass this along. Most of the members here already knew this but for a newbie I wish I had checked the label.