Feather-like-weight Merino wool is lighter than human hair and with the flexible synthetic rubber base the shoe itself is so lightweight that it’s lighter than a phone (size 6 standard). You’ll feel like you’re walking on the clouds. 365 Days, All Season Wear Merino wool enhances breathability to evaporate dampness or sweat for freshness during the summer. In the winter the insulating effects of the wool keeps your feet warm. Super Soft As a feature of wool, the texture is super soft, thus can even be worn bare feet without any scratches or irritations. It also absorbs sweat twice as quickly. Light & Comfortable The shoe's outer sole uses lightweight EVA for compatibility with the wool's resilience and flexibility while beehive patterns in a tripod pattern provides stable traction. OrthoLite, used as the innersole, enhances comfort to provide cushioning and ensure breathability while the mate edition has an additional cushion that increases comfort. Cautions for Cleaning Please clean stains and dirt on the outsoles with a brush. Use lukewarm water (59-7°F) for hand wash. Or use wool cycle mode after inserting the shoes into a laundry bag if using a washing machine. Avoid washing with hot water and use wool detergent. Avoid direct sunlight or exposure to fire when drying. Please dry in the shade where it’s well ventilated. Never use bleach or detergent and avoid soaking shoes in the water for too long. The shape of the shoe may change slightly after drying, do not worry as they will return to its original shape when worn after drying. “I walked 20,000 steps during my trip and my feet didn't hurt at all." I bought these shoes before the trip. I put them on right away and walked over 20,000 steps on the day and my feet didn't hurt at all. The pictures also turned out beautifully! I am so satisfied that I will continue to wear them in the future!