Brush On Block 3.4g is a mineral sunscreen that provides UVA/UVB protection with an SPF30. It comes with an easy to use self-dispensing brush helping you to apply sun protection quickly and without mess. It can be worn underneath or on top of make up without interfering with your other products. Both water and sweat resistant, this makes it great for the beach but also makes applying sun protection for the whole family throughout the day less of a chore. It is so family friendly that it can be used on childeren over 6 months old.