Lululemon Wunder Puff Mittens These mittens are designed for warmth and are insulated with 600-fill-power goose down. They feature Glyde™ fabric, which is water-repellent and windproof. The mittens have a pop-top opening, allowing you to use your fingers for tasks like using a phone. A silicone print on the palm provides extra grip. The cuff has a toggle cinch to help lock in heat.