I love my Linda Leal and Kiki Rikki shells, but for the summertime, I wanted to get layering shirts that were "breathable" with a lot of cotton in the material. I found these 95% cotton, 5% spandex, long sleeve crew neck tees on Amazon for only $7.85 with free shipping (no Prime account necessary). The reviews say that these run small, so even though most people wear shells a little bit snug, you might want to order one size up. They come in 18 colors, sizes S/M/L. They got 3.8 out of 5 stars over 214 customer reviews.
This post may contain affiliate links, which means you help support Daily Cheapskate when you make a purchase through these links. Read the full disclosure here.