Boots of Elvenkind

Wondrous Item, Uncommon

While you wear these boots, your steps make no sound, regardless of the surface you are moving across. You also have

If you have Advantage on a D20 Test, roll two d20s, and use the higher roll. A roll can't be affected by more than one Advantage, and Advantage and Disadvantage on the same roll cancel each other. See also D20 Tests.

on Dexterity (

Dexterity (Stealth) allows you to escape notice by moving quietly and hiding behind things.

) checks.

Source: Dungeon Master's Guide, p. 239