text: In the summer, if you’re not rocking a “combat shirt”, there’s a way to ensure that you’re not overheating if you need to wear long sleeves. I had a BDU top raid mod’d, but I also had jersey type material sewn on the axillary on both sides. Same thing with the pants, but I had it sewn in the crotch. Better air flow and what not. The M81 also has summer/winter if you’re in the Army/navy supply stores. Check the tag