Columbia Women's Large Walker Mill Heat Seal Down Omni Heat Jacket Green. This lightweight Columbia Women's Walker Mill Heat Seal Down Omni Heat Jacket in size large features a solid green design with a quilted pattern, zip pockets, and a zip closure. Made of polyester outer shell and lined with polyester, the jacket is filled with 60% duck down and 20% duck feather insulation, ideal for winter, fall, and spring seasons. The jacket also boasts Omni Heat technology for added warmth, making it suitable for outdoor activities like skiing. With a regular fit and machine washable care instructions, this jacket is versatile for travel, casual wear, work, or business settings. New with tags.