The Adventure Hat is the sun layer we file for hot and humid days. Sunday Afternoons still lists UPF 50+ (mesh not rated), 3.0 oz / 85 g, and $54.
The same page prints a 3.75 in brim on S/M, a 4 in brim on L/XL, and a 7.5 in neck cape. It packs flat. The brand asks you not to crease the brim.
Shortlist reason: a printed UPF rating, brim length, and ounce figure on sundayafternoons.com.