This is the Rob Allen 7 Liter Hard Foam Filled Float for SpearfishingFeatures: Hard Foam Filled Tough Polyethylene Outer Shell The new profile packs up in your Sportube much better than the older models. We took this float out and gave it a good run in the clearest water we&';ve seen all year. We really liked the way it sat in the water, highly visible to boat traffic and really tough. We ran this float together with a Floatline Bungie Combo and had a great wahoo setup. Also tows well behind boats for drift dives. The Rob Allen Float has a very tough Polyethylene Outer Shell which is the same material that kayaks are made out of. They can take an absolute beating and still perform. "