Merinos are lightweight, breathable, flexible, stretchy, super soft, machine washable, have a removeable insole, temperature regulating, odor resistant, and require no break-in period.Merinos are designed for ultimate comfort, crafted from soft, premium Australian Merino wool. Whether you're dressing up or staying casual. Best of all, they require no break-in period, offering instant comfort right out of the box. They are perfect for errands, walking, or everyday wear.Bin B21