The cuffs and hem are long enough for outdoor activities (e.g. if you wear the shirt under a paddling vest). I didn't have time to wear my shirt in hot weather, so I can't comment on breathability in hot weather.
Verified buyer
The products in Helly Hansen’s the Solen series protect your skin from the sun and help you stay cool. Their Lifa material effectively transfers moisture and dries quickly if necessary. This shirt works for all active leisure activities, from gym workouts to jogging and hot weather camping.
As a bonus, the fabric dries fast both after exercise and washing, and is exceptionally durable.