I'm a rower, and our club has ~40 rowers that show up on the regular for both sculling and sweeping. We have 8+s, 4+s, 4-s, 4Xs, 2Xs, 2-s, and 1Xs... all of which are shared as they are club-owned. We don't use the "bring your own" bat-logic shoes (HATED those!), we have the normal Hudsons, Vespolis, and H2Row shoes. Because they're club boats, they have to accommodate feet of all sizes, which means by default they have to be big enough for the biggest feet. For the ladies, that means (generally speaking) that our feet move all over the place in the drive, which means loss of applied power, like a bad transmission.Enter these shoe inserts... I put these bad boys in for my last few rows, and what a difference. They're just enough to fill the space past my toes to the edge of the men's size 12 without cramming or cramping, and I had ZERO slippage, which means all the power I put into the drive actually gets translated to the boat (as long as my blades are in the water, of course). And bonus round, they float. Because they're so comfortable, they're easy to forget after the end of the row when putting the boat away, but if that's the only thing I gotta remember, all the better.