Ilse Jacobsen laces are made of 100% cotton, and can be adjusted to fit your legs perfectly. New laces are available in several lengths and colours, made to fit each individual boots. While the Ilse Jacobsen laces are machine-washable, we recommend that you place them in a washing bag first, so that they don't tie themselves into knots. This lace is for the Classic boots RUB1 model. With these red laces you can give your Ilse Jacobsen lace-up long rubber boots another look.