Martex Baby 'Anti-Allergy 4 Tog' Duvet in White Size: Cot; Martex Baby Anti-Allergy duvet with added Micro-Fresh. Soft and fresh 100% cotton outer with a polyester fill, helping this make a great anti-allergy duvet for your little one. Micro-Fresh technology prevents odour causing bacteria growth and keeps bedding fresher for longer. It is also effective against E. Coli and Staphylococcus aureus. Martex Baby 'Anti-Allergy 4 Tog' Duvet in White Size: Cot color: White