Duvets – summer, winter, heat & cold
Hi Jacqueline, You're on the right tracks as a silk duvet is one of the best duvets for breathability and temperature regulation, keeping you cool in summer but also warm in winter. Our current favourite is the John Lewis Mulberry Silk Duvet - it's had rave reviews from it's buyers and gets a 5* from us as it's reasonable, ethically sourced and good quality silk.
TK Max sell other branded products under their name so it's difficult to tell which duvet you actually have. Your down duvet should be cool enough for most spring and early summer nights but 7.5 tog can get hot in the warmer summer spells. If it's really good quality down then it will still be warm even at 3-4 tog, as down produced by birds is warmer the further north you go. Again, I can't actually tell what exact product it is from your description as there are quite a few duvets out there labelled 'arctic down'.
If I were you, I would definitely go for a 3-4 tog duvet if you're finding a 7.5 tog too warm in the summer months. The other thing to look for is guaranteed quality - retailers like The White Company, Soak and Sleep and John Lewis have policies regards ethically sourcing down & silk and can tell you where your duvet has come from. I would prefer to buy from one of these rather than risk a poor quality product from a manufacturer who is not being quality controlled or environmentally / ethically guaranteed.
The silk duvet we mentioned before is from John Lewis and is available in a 7 tog or a 3-4 tog, which could suit you well. It has rave reviews from it's buyers and we thought it was one of the best silk duvets we've found. https://www.duvetadvisor.co.uk/custom-review/john-lewis-natural-collection-mulberry-silk-duvet-review/