Hey all, I'm about 280 lbs and looking at coil mattresses. I keep reading about coil gauge this and coil count that, but how do I actually tell if the coils are strong enough for someone my size? Is there a way to test in-store or a spec I should look for? I don't want to sink through after a year.
coils
How do you know if a mattress has strong enough coils
Coil gauge is the big one. Lower number = thicker wire. For heavy sleepers you typically want 12-13 gauge. If the listing doesn't Say, ask the manufacturer. Also coil count matters less than gauge and coil diameter.
Or just sit on the edge. If it collapses like a cheap lawn chair, walk away.
This. I'm 300+ and learned the hard way. Bought a 14-gauge pocket coil online, felt fine for 3 months, then started sleeping in a trench. My current bed has 12.5 gauge coils and it's been solid for 2 years. Also check if they use a zoned coil system—firmer in the middle.
What about coil count though? I've seen some 1000+ coil mattresses that still feel weak. Or is that just marketing?
It's mostly marketing. A 1000-coil queen with 15 gauge wire is still gonna be flimsy. Fewer, thicker coils > tons of thin ones for heavy folks.
Also pay attention to the support layer. Some beds have strong coils but cheap foam that breaks down. Look for high-density foam (at least 1.8 lb/ft³) above the coils. And if you can, check the edge support—if the coils are reinforced around the perimeter, that's a good sign the build is solid.
I've heard that some brands list 'coil gauge' but not the steel temper. Is that a thing? Like, two coils same gauge but one is heat-treated differently?
Sort of. Heat-tempered coils hold their shape better. But honestly, for heavy sleepers, the best thing is to look for a mattress with a high weight limit and a generous trial period. Sleep on it for at least 30 nights and see if you can feel the coils pressing through or if it starts sagging. No spec sheet beats actual experience.
Thanks, that makes sense. I'll stop obsessing over coil count.
One more thing: if you're looking in-store, flip the mattress if it's two-sided. If it's one-sided, press hard with your palm in the center and see if you can feel the coils. You shouldn't be able to easily compress them. Also, ask if the coils are individually wrapped—pocket coils tend to be better for heavy sleepers becaus they move independently and don't transfer motion as much.