Ordered because I wanted a short sleeve coat as I work in my garage/shop to protect my street clothes. Works perfect. Order the next larger size. I sent back the 2X and got the 3X which fit my normal X/2X frame. I might cut out the back and sew in a screen/vent material cause I get pretty warm during Michigan summer days. So it depends on you usage and environment. Mine is worn as an overcoat outside in the summer. For my use, if it had a vented back side it would be 5+. Material is very good.