MarMar Copenhagen's thermal outerwear is windproof, water-repellent and breathable, made of a durable polyester material. This makes it ideal for transitional outerwear and will keep your child both dry and warm. Our Thermo clothing is windproof, breathable and water-repellent. It is treated with BIONIC-FINISH® ECO impregnation spray, which makes it water-repellent without the use of harmful chemicals. It is Oeko-tex® Standard 100 certified, which is your guarantee that there are no harmful substances in any part of our clothing. All our Thermo is antistatic and has elegant reflective bands.