Grade 6A Mulberry Silk Duvet, Pure Silk Shell

Double-cocoon, also known as doupion, silk forms when two silkworms spin one cocoon together. Its intertwined filaments create a fuller, more resilient floss, giving the fill lasting loft and spring.

Short-strand fill is made from shorter lengths of silk floss, which can shift, clump and leave thinner, cooler areas over time. Mulberry silk filaments can reach up to 1,200 metres; this describes the filament length, not the size of a finished sheet of filling. Our long-strand silk is drawn into continuous sheets and layered by hand to form an even, breathable web that stays in place.

No. The long-strand silk is opened and cross-laid by hand into an even, glue-free web and tacked in place at fixed points across the duvet, so the fill stays evenly spread and will not migrate to one side or leave thin cold spots.

No. Never machine wash or tumble dry the silk fill, as water and agitation mat the fibres, degrade the silk and shorten its life. Protect it with a washable duvet cover and wash only the cover. The silk itself needs only airing and the occasional spot clean.

Air the duvet outdoors in gentle sunlight for about an hour on each side, once or twice a year, to refresh the fill's loft. Spot-clean small marks with a little cold water, without soaking the silk. For a deeper clean, use a dry cleaner experienced in caring for silk duvets. Protected by a washable duvet cover, the duvet itself rarely needs cleaning.

Yes. Silk is naturally breathable and temperature-regulating; it wicks moisture and releases heat instead of trapping it, so you sleep warm without overheating. The lightweight summer weight (180 g/m²) suits hot sleepers and warmer bedrooms especially well.

Yes. Mulberry silk is naturally hypoallergenic and resists dust mites, mould and mildew. It also contains sericin, a natural protein associated with fewer allergic reactions. Our fill is certified to OEKO-TEX Standard 100, tested free from harmful substances, so it is gentle on sensitive skin.

This duvet comes in four weights. Summer (180 g/m²) is light and cool; Mid-season (320 g/m²) suits spring and autumn; Winter (500 g/m²) is the warmest; and the Four-Season set pairs the 180 and 320 duvets, which tie together for 500 g/m² in deep winter. Choose by the temperature of your bedroom rather than the season alone. Sizes run from 140x200 cm to 260x240 cm.

Yes, and it is harmless. A faint natural scent comes from sericin, the silk's own protein, not from any chemical treatment. Air the duvet for a few days and it fades, usually within a couple of weeks.

A well-made silk duvet, kept under a cover and cared for properly, lasts around 15 to 20 years. Long-strand, double-cocoon silk holds its loft far longer than short-fibre fill, which is why it costs more upfront and rewards you over its life.

This is our all-silk duvet, so the shell is 100% pure mulberry silk: smooth, cool and naturally breathable, with a short concealed opening so you can inspect the silk inside. We recommend always using a washable duvet cover, fastened at the corners, so the silk shell stays protected and rarely needs cleaning.

Silk is measured by fill density in g/m², also written gsm, rather than by tog. As a close equivalent, Summer 180 g/m² is about 2.5 to 4.5 tog, Mid-season 320 g/m² about 6 to 9 tog, Winter 500 g/m² about 10 to 13 tog, and the Four-season pair tied together about 12 to 13.5 tog. Treat those figures as a guide for comparison, not a specification. Tog measures insulation on its own and says nothing about how a fibre handles moisture, which is why two duvets rated at the same tog can feel very different by morning.

Yes. There are ties at each corner and eight or more around the duvet in total, so it stays put inside your cover instead of sliding down through the night. For the cover, match the duvet size or go a centimetre or two larger. A much larger cover lets the duvet travel; a smaller one flattens the loft at the edges. Sizes run 135 x 200, 140 x 200, 155 x 220, 160 x 210, 200 x 200, 200 x 220, 240 x 220 and 260 x 240 cm, so most standard covers have a direct match.

Yes, and it is usually the simplest answer when one of you runs warm and the other runs cold. Put two single duvets on one bed, each in its own weight, for example Summer 180 g/m² for the warm sleeper and Mid-season 320 g/m² for the cooler one. It is the ordinary arrangement across Scandinavia. A shared bedspread laid over the top keeps the bed looking whole by day.

Three things, mostly. There are no quills, so nothing works its way through the shell and pricks you in the night. The fill does not drift, so you will not wake to everything gathered at one end and a cold gap at the other. And silk sits closer: the same warmth arrives as a thinner layer that follows your shoulders rather than doming above them. What does not change is the cover. Dress it as you would any duvet, and wash the cover rather than the duvet.

Silk catches on dry skin when the weave is loose and the momme low. This shell is 22 momme mulberry silk, densely and closely woven, which is why it reads as cool and smooth rather than grabby. In practice you rarely touch the shell at all, because we recommend sleeping with a washable duvet cover over it. That cover is also what protects the silk and means the duvet itself seldom needs cleaning.