Joewrote a review of Castelli Estremo Gloves on December 10, 2013
Familiarity: I've used it several times
the last couple of years when the temp dips into the 30's or below, i've been using lobster gloves combined with wool gloves. this combination is warm and allows me extra space to put a chemical packet in if needed (necessary with this combination when it's sub-freezing), but dexterity was awful and the lobsters would occasionally slip on the bars/hoods. so i thought i'd try these out, based on all the great reviews. so far, i'm quite pleased! i've ridden with them for a couple hours in temps down to 21F with wind chill taking it down into the low teens; and that's before you factor in the wind chill i was creating myself by moving at about an 18 mph average. in this, they were fine and i basically didn't even think about my hands. and this is with just this one pair of gloves; no other glove liners, covers, or chemical packets! on the flipside, i've ridden with them in ~37F temps and my hands got cold from sweating too much! so they certainly do have a top end to their functional range as well.
grip with them is excellent. i hope it lasts. i've had to remove them a couple of times during rides and haven't had any issues with them wanting to turn themselves inside out or getting my hands back in, etc. dexterity is MUCH better than lobsters (obviously) and drastically improves the bike "feel" (on the bars). you can do small things like zip/unzip jackets as needed, but i'm not sure you could do bike maintenance or change a flat with them on. but that's true with any glove that will get you down below the freezing mark. i've not yet ridden with them in precipitation but honestly for the range these are intended (freezing or below) i usually stay in during snow/ice storms or at least wait until it passes. ice road riding is no fun. construction-wise, i give these top marks. they seem very well made with quality stitching and fabrics all over and the high cuff velcro closure is excellent. i anticipate they will wear quite well and last a while.