As well as keeping you warm, it's also usually machine washable and tumble drier-friendly. The downside? It's likely you'll need a different bed sheet type come summer.

 To sum up, the weight of a duvet insert plays an important role in determining its comfort and adaptability to different climates and personal preferences.  Whether you choose an ultralight, midweight, or heavy-duty duvet insert, understanding the features of each type will help you make an informed decision and ensure a good night's sleep.