I wanted to try this type fin for several reasons, but very put off by the SP Jet fin weight. OMS slipstream seems like a good solution. I tried on an XL Jet at my LDS (I do enough business with them that I don't feel guilty about abusing their time) and it fit pretty well.
So I ordered the XL slipstream from leisurepro. They counseled me to get the size L spring straps ("everybody goes down one size on the strap"). I ordered it, and in spite of me really wanting it to fit, my foot goes too deep into the foot pocket to be comfortable (digs hard into my instep) and also feels too sloppy wrt controlling the fin with my feet. FWIW, though, if I had been able to wear the XL slipstreams, it looks like the size L straps would be right.
I wear 9-9.5 shoes, my booties are size 9, and I'd call them "medium sole"; I can walk on rocks OK but they're not really thick or rigid. I don't feel like changing them.
LP took the fins and straps back without hassle and credited my card back. I have liked doing business with them for stuff that doesn't care about service or warranty, that's where I throw the LDS a bone. And my LDS doesn't carry OMS anyway.
So I'm now waiting for the Slipstreams in L to be released. Any news on that?
LP says they are "on order", but could give me no ETA.
FWIW, while I had them, I weighed them.
One Slipstream XL fin with stock rubber strap weighs 2 lbs 6.25 oz.
With the rubber strap removed and one size L spring strap added, it weighs 2 lbs 11 oz. But this includes the wire buckles for the rubber strap that I didn't want to cut out since I was returning them. I'll guess 1 oz. So call it 2 lbs 10 oz.
The XL slipstreams are 22" long wrt packing in a suitcase. One of several reasons for wanting to change are to get something that fits in a carryon. My Mares quattros don't. BTW, one size "regular" quattro fin with Wayward Son spring strap is 2 lbs 5.9 oz.
To repeat, anyone know anything about size L slipstream availability?