Snow White Down® Our softest fill material is natural, biodegradable and hypoallergenic* made of white duck down. Our natural down and feathers are sustainably and ethically sourced, and have independent third-party supply chain certifications from International Down & Feather Laboratory (IDFL),a global leader in filled textile quality and assurance since 1978. IDFL conducted a comprehensive audit to verify that our Down & Feather suppliers are in accordance with the IDFL Down Standard for animal welfare and traceability.