Big Agnes Blacktail 4 Footprint - Protective ground cover for Blacktail 4 tent. To extend the life of your tent floor, use a Big Agnes footprint or ground cloth. The Big Agnes footprint also enables you to pitch a lightweight, Fast Fly shelter while leaving the tent body behind. The Fast Fly configuration requires the footprint, tent fly, poles, and stakes. Features Compatible with Blacktail 4 tents featuring Tiplok Tent Buckles; Fast Fly setup available - stake out your footprint, insert your tent poles into corners, drape your fly over the top, and buckle it in for an even lighter, smaller packing setup; Fully compatible with Blacktail 4 models made after 2020 - may be compatible with older models, without Fast Fly capability;