Down vs Synthetic Sleeping Bags: Which to Choose
Down wins on weight, synthetic wins on wet. The choice follows the climate you camp in.
Down vs Synthetic Sleeping Bags: Which to Choose
The fill is the biggest decision in a sleeping bag, and it comes down to two families: natural down and synthetic insulation. Each wins on different ground, and the right choice follows the climate and the budget. This guide runs the trade-offs. For the full sleep category, see our camping sleep systems guide.
Warmth-to-Weight
Down is the champion of warmth-to-weight: it traps more air per gram than any synthetic, so a down bag is lighter and packs smaller for the same warmth. The measure of down quality is the fill power (higher is warmer per ounce) — 600 is good, 800 is very good, 900+ is premium. For backpacking where every gram counts, down usually wins.
Synthetic is heavier and bulkier for the same warmth, but it costs less and handles damp better. Our down sleeping bag for cold weather and yellow duck down sleeping bag show the down builds; our durable warm cotton sleeping bag shows the synthetic/cotton side.
| Aspect | Down | Synthetic |
|---|---|---|
| Warmth-to-weight | Best | Lower |
| When wet | Loses loft | Retains warmth |
| Cost | Higher | Lower |
| Working life | Long | Shorter |
| Best for | Dry cold | Wet, value |
Wet Performance
The decisive difference is water. Down loses its loft — and its warmth — when it gets wet, and it dries slowly; a soaked down bag is a cold night. Synthetic insulation retains much of its warmth when damp and dries faster. For wet, humid climates and for anyone who expects to get the bag wet, synthetic is the safer choice.
This is why the advice splits by climate: dry cold (mountains, winter) favours down; wet and humid (rainforest, coastal, shoulder-season camping) favours synthetic.
Cost and Durability
Down costs more — the higher the fill power, the higher the price — but a well-cared-for down bag lasts for many seasons. Synthetic is cheaper and easier to care for, but the insulation degrades faster with repeated compression, so a synthetic bag has a shorter working life. For value and low maintenance, synthetic; for performance and longevity, down.
A buyer stocking both covers the market: the down tier for the backpacker and the cold-weather camper, the synthetic tier for the value buyer and the wet climate.
Care and Storage
Both fills last longer with care. Store the bag loose (in a large cotton sack, not compressed) so the insulation keeps its loft, and wash it rarely and gently. Down needs a down-specific wash and a long dry with agitation to restore loft; synthetic is more forgiving. A compressed bag that never gets to expand loses warmth over time — the storage habit is part of the bag's life.
Which to Choose
The decision in one line: choose down for cold, dry conditions and light weight; choose synthetic for wet climates, value and easy care. For a camper who only owns one bag, the answer often follows where they camp most. For the temperature side, see our sleeping bag temperature ratings guide; for the general choice, our how to choose a sleeping bag guide.
Sourcing Sleeping Bags Wholesale
Sleeping bags are a seasonal, high-reorder category with a wide price range from synthetic entry to premium down. The margin sits in the down tiers while synthetic bags carry volume. The QC points are the fill power (for down), the fill weight, the shell and lining fabric, the zip and the loft, all sample-verifiable. Factory-direct MOQ is typically 200-500 pieces per model, with OEM/ODM through our sleeping bags range.
FAQ
Is down or synthetic better for a sleeping bag?
Down is warmer for its weight and packs smaller but loses warmth when wet; synthetic retains warmth when damp, dries faster and costs less. Dry cold favours down; wet climates and value favour synthetic.
What is fill power in a down sleeping bag?
Fill power measures how much space an ounce of down lofts — higher is warmer per ounce. 600 is good, 800 very good, 900+ premium. Higher fill power means more warmth for less weight.
Do down bags lose warmth when wet?
Yes — down loses its loft and warmth when wet and dries slowly, so a soaked down bag is cold. Synthetic insulation retains much of its warmth when damp. That is the main argument for synthetic in wet climates.
Are synthetic sleeping bags cheaper?
Yes — synthetic is cheaper and easier to care for, but the insulation degrades faster with repeated compression, so its working life is shorter. Down costs more but lasts many seasons with care.
What is the MOQ for wholesale sleeping bags?
Factory-direct MOQ is typically 200-500 pieces per model, higher for custom fills or branding. Samples take 7-10 days.
Get Wholesale Pricing
Sourcing down and synthetic sleeping bags at factory-direct prices? Reply within 24 hours with MOQ, pricing and sample options. Contact us for a quote.