Kathe Kruse Bath Towel, Chopin Frog by Kathe Kruse. $67.92. Kathe Kruse Bath Towel Chopin Frog is made of 100% cotton terry. Not only is the material soft, it's also safe and non-toxic. Kathe Kruse tests all their fabrics for toxic chemicals. Bring this bath towel on your next trip to the pool or seashore. Use this bath towel as a cover-up to help protect your baby's delicate skin against the sun's rays.