It's very light weight and comfortable! If you want it to be even more weightless you could also mix it in with your favorite moisturizer for a Tinted Moisturizer effect. I've done that on hot, sticky days that I'm just going to the beach!
I have been using this foundation everyday with a light primer underneath and I have found it to be super light weight! It barely feels like anything is on my face when I'm wearing it and it makes my skin feel moisturized!