Foundation Long Sleeve - Black Size S I received this pullover as a gift. I wear an XS or S normally. I liked the S because I could wear a sports bra and tank underneath and not feel constrained by layering. It is the perfect weight for running in 50-65 degree weather. The fabric is a great weight. I love the single zipper pocket with right or left openings. I put my phone in the center pocket while walking my dog and I could quickly access my phone with either hand. A nice plus! Being 40+ my bottom is not as attractive as a 20 year old. I liked the longer length for that as well as for the warmth. I would definitely recommend this piece! It also washed really well!