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There have already been 6 alternatives to Jets suggested
I just weighted my size L Jets with springstraps and the weight of the pair is about 5 lbs 14oz. From what I recall XL Slipstreams with SS are about 5 lbs 4 oz. Two size "regular" quattro fins with spring straps is around 4 lbs 12 oz. Removing the SS saves about 8 oz. So you're not talking about huge differences IMO