Climbing gloves primarily aren't designed to keep your hands warm. Instead, they're mostly designed to wear while belaying, abseiling and securing. Gloves for special types of climbing, like crack climbing, where you wedge your hands into tight crags, exist to protect the back of the hands from abrasions. There are also gloves available specifically for via ferrata. Climbing gloves are usually made of abrasion-resistant materials (often leather) and often have additional reinforcements at the palms, knuckles and joints.