Avocado Sock: Ripen Avocados to Perfection Get a perfectly ripe avocado every time! Just pop an unripe avocado into the cozy wool sock and leave it. In just a day or two, a hard, green avocado becomes perfect for consumption. Sized just right for avocados - holds one avocado at a time. 100% natural wool. Color: Olive. Made in Canada. How to Use the Avocado Sock: Insert un-ripened avocado into the sock and place in a warm, dry place. Do not remove avocado from sock while ripening. Press gently on avocado through top opening to check for ripeness. Avocado is ripe when it yields to gentle pressure. It will ripen in as little as 24 to 48 hours.