Looking at updating bindings for my wife Katie. She's is so close to getting a full pass at 26mph. She was on a 65" Connelly F3 Concept with XS Stoker Bindings Double High Wraps (too tight) and now she's moved up to a 63" HO Siren (based on wide ride like Burner/Triumph).

Thinking for adding some comfort at checking out the new RADAR "Sneakers" like the Source versus Rail Bindings. Anyone have any experience with these?

She wears a size women's 7.5, so traditionally a SMALL is ideal.

Some great RADAR Boots 101 by Sully http://www.proskicoach.com/gear/radar_boots/

BOOT DIFFERENCE
http://www.radarskis.com/boot_tech.html

http://www.radarskis.com/source.html
RADAR - SOURCE
"The Source is built on the same Custom-Fit Chassis as The Rail. This boot is more comfortable than your favorite pair of shoes. The Source is not as stiff in the cuff, and the foot bed is softer. It's a great alternative back boot when paired with the Rail in front, as it's a little lower cut."

http://www.radarskis.com/rail.html
RADAR - RAIL
"Let's think about conventional boots for a minute. They are simply a bunch of parts stamped out of a sheet of rubber/EVA and screwed (with sheet metal screws) into hardware. How can something that was made with screws be comfortable on your feet? Our boots are made like shoes. Made to fit the foot. Made for comfort. The Rail Boot rips in the course as well as freeskiing. This boot grabs your foot for unbelievable control. It is, of course, in a totally different league from conventional boots as far as comfort. The laterally stiff upper cuff is internally lined with super soft foam and the foot bed is stiff enough for response but still soft enough to conform to your foot. Our Pro-Fit Chassis System is grabbing the base of your foot, where you truly control the ski from, allowing more freedom with your knees for balance and stability without interrupting the ski's path."