Leather is a popular choice among high heat gloves.
The Ozero Leather High Heat BBQ Gloves are said to have a whopping heat rating of 662°F.
They have a thick 100% insulite cotton lining, 16" sleeves, and are constructed of cowhide with double patches of leather in sensitive areas, with double thick leather in some locations.
The only size is large, so these gloves may not be suitable for small hands. They are available in grey or black, can be washed with soap and water, and have loops so they can be hung to dry.
Heat resistance. 23 seconds
Dexterity. Easily used tongs and picked up a small paring knife
Comfort. Very comfortable, nice feel, with room to move all fingers easily