The nice and light with flatlock low bulk seams to avoid chafing, especially when carrying packs and a good length zip with chin guard to give you a breather when working hard.
Incorporated into the fibres of this tee and for the garment's lifetime, is Polygiene Odour Control Technology. This is ideal if your top cannot be laundered for a few days, you will still feel nice and fresh.
At approximately 4oz, the Interval Tee is fine worn by itself during the summer months and has a UPF 35+ sun protection factor. Then wear it as part of a layering system in the colder months.