When a swarm of biting bugs is doing their best to keep you from tying on the next fly, it's time to either call it a day or call in reinforcements. The Simms BugStopper® Intruder is all the reinforcement you'll need. This technical shirt has InsectShield® to keep the bugs at bay and COR3™ tech to wick moisture, handle odor and give you UPF 30-worth of sun protection. The BugStopper® Intruder is constructed of quick-drying, durable, woven polyester on the main body and knit side and arm panels for major mobility whether on the cast or on the oars.
Thus far, the Simms Bugstopper shirt does a great job of keeping away biting flies and mosquito's. It is very comfortable and cool. I used this while fishing in WY when the temps were in the upper 80's (cooled to 50's) and it did keep me relatively cool. I really like the sleeves, except they are more difficult to roll up. Overall, great shirt.