In all things Castelli I'm a medium, and these gloves are no exception, my hand measured 8, and these are a perfect fit, I doubt I'd get a liner under them but they are so warm I probably wouldn't need to, I've been out today in 5°c for 3 hours and not once did I notice my hands getting cold, I ride on the hoods and my index finger covers the brakes so is always exposed to the elements, in the past this finger is the one that goes cold first then numb, not anymore, my hands were really warm but without the sweat buildup you get with most winter gloves, at one point during my ride I stopped and removed a glove to retrieve a gel, in the past I'd have to battle to get my old winter glove back on due to being damp from sweat, with this glove my hand just slipped straight back in, really nice warm fleece lining with the gore fabric makes for an amazing glove, yes their expensive as is everything these days, but what price can you put on warm hands ?, if it means I can ride for longer once the temperature drops then to me their worth every penny.

Castelli say on their website the temperature range for their winter gloves is Perfetto 4 to 14, Perfetto Max 0 to 10, Estremo -5 to 5 celcius. I bought all three on offer to replace my worn out early and deep winter gloves. I don’t think any of the Castellis are good for the bottom of the claimed temperature range unless you run very warm. The Perfetto Max is good for a lot of the British winter, comfortable and dexterous. If in doubt I take the standard Perfetto or Estremo in a pocket as spares. I have not tested them in prolonged rain but I expect they will soak through.