Side by side
HyPURGel vs FoamByMail
HyPURGel
9 positive (69%) · 3 mixed (23%) · 1 negative (8%)
Trust + time weighted: +68%
Top excerpts
Ideally I'd like to keep the Serene > Hypurgel comfort layer, though I can live without. I really like this combo. I feel like the hypurgel airiness saves the serene from getting too hot. They aren't too temperature responsive and they feel oddly supportive and soft.
HypurGel adds a buoyant, cooler feel but won’t match memory foam’s deep cradle-great as a thin top layer if you hate the stuck feel.
It's good stuff. I use it in my DIY. The cooling effect is subtle at best. I think it's very supportive and conforming, but it doesn't make up for having the wrong mattress core.
There are plenty of temperature-neutral polyfoams like Serene and HyPURgel that don't suffer from the heat sink issue traditional memory foam has.
there's also HyPURgel, that should be more durable than conventional polyfoam
FoamByMail
7 positive (70%) · 3 mixed (30%) · 0 negative (0%)
Trust + time weighted: +71%
Top excerpts
Based on my experience I would recommend foambymail.
If your weight is over 300, get 3” of Dunlop from foambymail. I did this when I was 400-500 and it was the best sleep I ever got on a super firm mattress.
Technically, it can all be purchased at Foambymail. But you won't be able to return anything if it doesn't work out. I wouldn't trust their convoluted foam over what DIYREM has.
Foambymail.com : HD36 Poly foam core and 5lb memory foam.
I have 1” of HD foam on the bottom of the TPS 15.5 springs and then 2” 29ILD dunlop latex (from foambymail) as my transition layer