Hi Barbara,

 

Thanks for your question.

 

As you have mentioned the John Lewis range do not have associated GSM attributed to their models and so a precise comparison cannot be made. We however, fully disclose the full breakdown of all our products, as below.

 

Our Artisan Naturals mattress is very much a true medium feeling model in the top layers providing a slight sink into that top layer but not too much. It has the benefit of having 85% natural fillings that will provide a cool sleep surface; Ideal for anyone who identifies as a hot sleeper.

 

 

	John Ryan By Design Artisan Naturals	Vi Spring Regal Superb
1	1200gsm Blended British Fleece Wool and Cotton.	900gsm Blended real Shetland Isle Fleece Wool and Cotton
2	Hairproof Cambric Cover	Hairproof Cambric Cover
3	1250gsm Rebound Poly Cotton	1200gsm long stranded Horsetail blended with British Fleece Wool
4	1500gsm 100% Pure Mohair	1000gsm Bonded British Fleece Wool and Cotton
5	1600 Calico encased Pocket Springs [ 49mm ] [1.28mm ]	1720 Calico encased Pocket Springs [48mm ] [1.28mm ]
Total GSM	3950gsm	3100gsm

 

At your body weight you are matched with a Medium spring tension to get the right level of support. The only thing that determines the spring tension is your body weight as this is what provides you with support;

 

Bodyweight	Spring tension
Upto 16 Stone / 50-101kg	Medium (1.4mm)
16 Stone / 101kg Upwards	Firm (1.6mm)
Available in Bespoke Products (Please Call)	Soft (1.2mm)

 

That mattress is fine to go on to a slatted bed base as long as the gaps between the slats are no bigger than 3". If they are then all you would need to do is purchase some standard sheets of MDF, plywood or pegboard. This is due to the fact that the mattresses will attempt to settle in any gaps bigger than 3" causing indentation and damage.

 

I hope this has answered your questions fully but if you do have any further queries please don't hesitate to contact our office on 0161 437 4419. Our office is open Monday to Friday 8am to 8pm and Saturday and Sunday 10am to 4pm.

 

Kind Regards, Lee.