I bought these last year and used them during the summer, but I didn't use them at all this summer because I had other heat対策 (heat countermeasures). There are no noticeable stains, but I erased the names that were written on the two items in the second photo. ◎ Top right, blue: Size L (for adults, fits loosely) Neck circumference 37cm / Inner diameter 11.5cm / Thickness 2cm ◎ Bottom right, white: Size XS (for elementary school students up to mid-grades) Neck circumference 27.5cm / Inner diameter 8.5cm / Thickness 1.7cm ◎ Top left, white, bottom left, brown: Size M (for adult men and women) Neck circumference 33-36cm / Inner diameter 10-11cm / Thickness 2cm I purchased these on Rakuten.