The Advance is more textile than leather although, as with most gloves, the palm is leather. The main chassis of the glove is infused with Spandex stretch material for comfort. The palm and inner surfaces are made from goats' hide.
For added abrasion resistance the gloves are lined with Halvarsson's Kevlar-style fabric known as Hi-Art. This increases the strength of the textile surfaces by 500%, and the leather areas by 200%. Of course, for impact protection, there are hard knuckle protectors.
The waterproof membrane is Halvarsson's own; it's called Dryway Plus. In testing, it outperforms Gore-Tex in certain areas.
To keep your hands warm, the gloves use two different components. There's Thinsulate, which is a super-thin fibre that delivers heat by trapping warm air generated by the body within its structure.
The Advance gloves also use Outlast. Outlast is very sophisticated. It stores heat in petroleum molecules in the membrane and then, when you get cold, it pays the heat back. It's thin, but very effective, although Outlast works best if you get heat into the membrane before you go out in the cold. To do this, you should wear the gloves for some time before setting out. Or leave them close to a radiator.
But the great thing about Outlast in a glove is how well it works with heated grips. If you put the heat on, your palm will warm up, but this heat will the spread around the membrane to the back of the hand.