Never owned a gillet, do you not just end up with cold arms? Or is the advantage that they are packable so you can take it just in case/remove after warming up?
As above, keeps your core warm, but also (for me) allows you to tweak just how warm you are, yes a Gilet is easier to remove and pack if you’re boiling, you can also open the zip and take off arm warmers (arm warmers are a default bit of kit to go with a Gilet IMO) and stuff them in the back pocket to manage your temperature (goldilocks stuff I’m sure). You can also put an otherwise useless thin, packable ‘Shell’ jacket over the top of a Gilet if your really cold and/or dealing with heavier rain, where I often find most jackets a bit “all or nothing”; either boil in the bag or thin and useless in cold weather. Gilets are just a more discretely adaptable bit of clothing.
My stupid question for anyone who has the Izoard already, it states In the description:
“Reversible Design: Features a warmth-reflecting Mylar inner and a water-resistant DWR-coated outer shell.”
Does that mean the Gilet offers a bit less warmth if reversed i.e. with the Mylar layer on the outside? or am I being a bit dim? Obviously if it’s showery you want the DWR layer out, but then how waterproof is the Mylar if you happen to run it shiny side out on a wet day? I’m wondering what the point of making it reversible really is to some extent…