Your down gear could be soaking up water just because it is dirty. First, try cleaning it with Nikwax Down Wash.Direct, and if it is fairly new, or recently re-waterproofed, the Durable Water Repellency (DWR) will be revitalized just from cleaning.
eBay
Nikwax TX.Direct® Spray-On can be applied to the outer face fabric of waterproof clothing, providing Durable Water Repellency (DWR) without compromising internal wicking properties. NIKWAX 1 LITRE TX DIRECT SPRAY ON WATER-PROOFER.
eBay
Always apply this product to used footwear to keep them in perfect condition. Brush off dirt with a damp cloth and clean using Nikwax® Footwear Cleaning Gel. Shake well before use. Press sponge applicator to break seal.
eBay
Nikwax Fabric & Leather Proof Spray 300 ml.Breathable waterproof footwear is most likely to get sweaty and wet inside when used in damp or wet conditions. If the outer fabric or leather absorbs water, the breath ability of the footwear will be reduced.
eBay
TX Direct wash-in is an easy to use, high performance waterproofer which adds water repellency and revives breathability without tumble drying. Easy to use in your washing machine and by hand, non-flammable and PFC free.
eBay
1 LITRE BOTTLE OF TECH WASH. Use Tech Wash instead of detergents or washing powder. Removes detergent residues left behind by previous washes. Lifts out dirt that can attract water and mask water repellent finishes.
eBay
The Nikwax Tech Wash Cleaner is a market leading cleaner designed to revitalise water repellency and breathability of waterproof gear. Easy to use in your washing machine or by hand, non flammable and PFC free.
eBay
High performance waterproofing conditioner designed to add suppleness and soften smooth leather clothing and accessories. Easy to apply by hand, non flammable, PFC and aerosol free. For waterproofing leather.
eBay