MUJI Walker: UV Cut, Sweat-Absorbent, Quick Drying This is a sweatshirt made with a stretchy and flexible material for a comfortable feel. The quick-drying and UPF 50+ fabric make this sweatshirt suitable for casual and outdoor wear, protecting you from harmful UV rays and is suitable for light exercise. ⓘ MUJI Walker is a unisex range featuring quick-drying fabrics and UPF 50+ UV protection, for daily wear and light exercise.