The Sea to Summit Sentinel Footprint is cut precisely to the Sentinel tent's floor, reducing the risk of water pooling underneath during sustained rain rather than just guarding against abrasion. Durable 68D waterproof fabric and Hypalon attachment points at the pole tips also unlock a Fly Only setup, so a group can pitch a lighter, more open shelter when conditions allow it. What Our Gearhead(R) Experts Are Saying:"We got hit with steady rain for two days straight, and the ground under the tent stayed dry instead of pooling up the way a loose-fitting footprint usually lets happen. Breaking camp dry the next morning made the whole trip feel less miserable than it should have."