Someone may have answered this, but I'm too lazy to thumb through the comments. Can anyone tell me how firm this mattress actually is?

It's so funny how one persons medium can be another's firm. I have had the mattress for 4 years and found it to be medium I weigh 180 and it's a bit squishy for me and thus I'm shopping again, worth noting it's.10 inch and on a platform bed. It does stay way cooler than my previous foam but the top which I think is intended to grip the bedding more tends to get worn and dirty super easy so buy a protector for sure.

maximum weight on twin mattress? (8" + 10")?

The 10" Twin XL, says it's suited for up to1000 lbs ... however, 300 lbs as a side sleeper, was not very comfortable. Laying on back or stomach was fine, but not the side.

Does this mattress have fiberglass under its cover?i have been reading reviews on a few other brands on Amazon, and buyers were complaining about tha

It has a fiberglass sock/cover. We have 3 of these mattress and have never removed the sock/cover and have stray fiberglass fibers under the bed as well as poking through the sock/cover—the fibers can easily be seen with a flashlight. We purchased full zippered mattress encasements to contain the fiberglass. It seems to work? So I’d recommend anyone purchasing add the price of the encasement into the cost.

can I use this on an adjustable hospital bed please?

Yes, you may use an adjustable base with this mattress.

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❄️ Sleep Cooler, Wake Refreshed — The Mattress Millennials Crave!

STAY COOL ALL NIGHT - Advanced ventilated gel foam actively regulates temperature for a refreshing sleep experience.
UNBOX RELAX INSTANTLY - Convenient mattress-in-a-box design expands quickly for effortless setup and immediate comfort.
PRESSURE RELIEF PERFECTED - Medium firm support cradles pressure points and promotes optimal spinal alignment for all sleep styles.
BREATHE EASY SLEEP BETTER - Open-cell foam structure maximizes airflow to prevent overheating and maintain comfort.
CERTIFIED SAFE SUSTAINABLE - CertiPUR-US certified, fiberglass-free foam ensures a healthy, eco-conscious sleep environment.

The Cool Gel Chill 14-Inch Medium Firm Memory Foam Mattress Twin XL combines a 3.5-inch ventilated cooling gel layer with high-density medium firm foam and an open-cell breathable design to deliver superior pressure relief and temperature regulation. CertiPUR-US certified and made in the USA, this mattress-in-a-box offers a safe, eco-friendly, and easy-to-setup sleep solution that supports spinal alignment and keeps you cool all night. Bonus memory foam pillow included for enhanced neck support.