I worked at Pennzoil in Roseville, PA when I was in college (ie summer vacation - 1970's) so I couldn't help but buy this t-shirt. Don't expect a thick t-shirt. The fabric is thin but very soft and very comfortable. The big one is a little tight for me, but the fabric stretches and doesn't shrink. Conclusion - Overall I am happy with this shirt and would buy another one in the same size. Enjoy!