I'm looking to improve on the design of the Buffalo Mitt or the Montane Extreme Mitt as it pertains to my climbing style. I like wearing a light/mid-weight powerstretch glove inside a highly breathable but windproof mitt. The problem is when I need dexterity the mitt will hang on the idiot cord collecting snow, and will require two hands (and momentum pause) to re-equip. I want what's called a 'convertible' mitt where the finger section folds back without removing the mitt. There are a number of these on the market (although not enough, in my opinion) but they all fold back to reveal an internal glove cross-section (see: Black Diamond Men's WindWeight Mitt), are too lightweight, or have membrane shells (read: traps moisture). I'd much rather have a 'lobster' style internal so there is room for my mid-weight climbing glove to fit. A lobster style has a single strap of fabric between the middle and ring fingers… essentially a regular mitt but that strap prevents the mitt from sliding down on the wrist.
The best material that I've found thus far has been the Pertex pile fleece in a (relatively) windproof shell… it seems least affected by sweat or moisture and is super-lightweight. The Buffalo Mitt has been around forever and with the exception of the short gauntlet and slippery, fragile material it is a damn good storm mitt for only $30. The Montane Extreme Mitt improves these limitations with only a slight weight and price increase. If I could find something very similar to the Extreme Mitt, convertible, with an internal lobster strap it would be absolutely PERFECT. I'm hoping someone knows of a cottage manufacturer or some relatively unknown or forgotten mitt brand.
edit: failing an existing design, I may take needle and thread to an Extreme Mitt and create a prototype.
Pertex pile
Breathable, wind-resistant shell (not membrane, WindBlocker, GoreTex, etc)
Convertible/finger flap
'Lobster' internal style
Leather palm, thumb… possibly reinforced in key areas
Ideally a long forearm gauntlet with cinch closure
Affordable ($199 for Alti mitts?!)

