Well-Insulated

You can tolerate extremely cold temperatures. You gain the following benefits:

• Increase your Dexterity, Constitution, or Intelligence score by 1, to a maximum of 20.
• You have advantage on Constitution saving throws made to avoid exhaustion due to extreme cold, and each slowed level only reduces your speed by 5 feet, unless it would reduce your speed to 0.
• You have advantage on saving throws made to avoid cold damage.