Kuiu Gila Boonie
Matt wears Kuiu's Gila boonie and loves it. The current version is the Gila PRO Airmesh Boonie: 3.2 ounces, UPF 50+, with a packable brim.
Stormy Kromer Original Cap
Matt and Peter both own the Original Stormy Kromer Cap, the wool cap with the pull-down earband. It's $50, cut and sewn in the USA, and guaranteed for life.