Patagonia gloves are made of high-end Japanese superstretch neoprene for an amazing mold to your hand. The exterior is made of smoothskin to deflect wind, and the interior is poly fleece for moisture wicking. Seams are sealed to keep cold water out.
5mm gloves are generally appropriate for 50 degrees and up
Patagonia does wetsuits differently. They stand behind every suit with a lifetime warranty (does not cover wear and tear, of course.)