When we were developing the Stanton prototypes, we went through a lot of welders and one big issue was heat resistance.  We found out that even those which passed ANSI certification (which we thought would be plenty) were not enough at all.

At that point, we made the decision to double up on the kevlar.

Kevlar itself is a pretty tough material against fire as its said to withstand thermal hazards up to 800–900°F, and only degrade after hundreds of hours at 160c.

After getting into it, we learned that the levels are as follows

Each level represents the maximum temperature at which a second-degree burn takes at least 15 seconds to occur and there is at least 4 seconds of warning before the pain is felt. This gives the wearer time to react and move away from the heat source.

Level 0: Less than 80°C or 176°F
Level 1: 80°C or 176°F
Level 2: 140°C or 284°F
Level 3: 200°C or 392°F
Level 4: 260°C or 500°F
Level 5: 320°C or 608°F

Ours are level 2, we could stack the Kevlar more but:

• For most welding types, level 2 is adequate and above most nimble welding gloves out there which market themselves as heat resistant
• The nimbleness would be reduced even more, and putting these already difficult gloves together could be perhaps impossible.

So, this is it, heat resistant level 2 gloves protected by quality DuPont Kevlar underneath the fancy Nubuck leather and design.