Simba Hybrid Duvet reviewed

The Simba Hybrid Duvet is a 10.5 tog, all-season duvet with a soft, down-like fill made from recycled plastic bottles and a cotton cover treated on one side with Simba’s cooling Stratos finish. It is by far the best-reviewed duvet Simba sells, 4.8 out of 5 from 18,041 reviews, and costs £139 for a single.

Fill, cover and warmth

A tog rating measures how well a duvet holds in warmth, and 10.5 is the usual middle choice in UK bedding: warm enough for spring and autumn, a little warm for August. The fill is Simba Renew Bio, a polyester fibre spun from recycled bottles and designed to let air move through it, so the warmth feels drier than in a dense hollowfibre duvet. Square stitching keeps the fill spread evenly instead of drifting to the edges.

One side of the cotton cover carries Stratos, a finish Simba says measured up to 3°C cooler than untreated fabric in tests by HeiQ in November 2020. That is a fabric test, not a whole night under the duvet, but it explains why the top side feels cool when you first get in. A label at the foot end shows which way round it goes.

Sizes and prices

We checked these prices on simbasleep.com on 15 October 2026. Delivery is free and usually next day for orders before 1pm. The duvet arrives in a reusable storage bag, handy for spare-room storage.

Who it suits, and the drawbacks

Choose the Hybrid if you want one duvet on the bed for most of the year and you run slightly warm. The NHS sleep advice recommends a cool bedroom, and a breathable fill with a cool-touch side helps when the room is not as cool as it should be. Simba also shows a menopause-friendly symbol on the page; the NHS guidance on menopause symptoms lists night sweats among the common symptoms, which is where a cooler duvet can help. It is machine washable at 40°C, but a king or super king needs a large drum, and Simba recommends a commercial dryer. Duvets fall under Simba’s standard 30-day return on its returns page, not the 200-night mattress trial.