Fiberglass in the mattress?

I don’t know if it does or not. Fiberglass based fire repellant is used by most manufacturers no matter what they disclose. They are not required to reveal what type of fire barrier they use. Typically you can order a mattress without fire retardant only if you get a prescription from your doctor. We would have bought the mattress anyway...the best.

Do you leave a big dent in it when you sleep in the same posirion every night?

Yes. I weigh 214 lbs. This is considered “Big and Tall” which is NOT recommended for foam or hybrid (weaker springs than conventional) mattresses according to a prominent consumer magazine. I didn’t discover that until I read the fine print. If you weigh less than 200 lbs., then it’s only a matter of time before the foam crushes.

How is the “stabilization” with this bed? Being a light sleeper, trying to limit how much I feel movement...

I also am a light sleeper and find no problem with stabilization. It all depends also on what type bed frame you use. I find the bed very good.

I’m a side sleeper will this mattress work for me

Always sleep on one side or the other and the Casper is great! Very comfortable for me. I had no trouble adjusting to a new mattress either.

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🛌 Elevate your sleep game with Casper’s hybrid innovation — because your spine deserves VIP treatment.

BALANCED HYBRID COMFORT - Experience the perfect fusion of plush memory foam and responsive springs for all-night support and breathability.
ERGONOMIC ZONED SUPPORT - Targeted firmness zones cradle your hips, waist, and lower back to maintain ideal spinal alignment and reduce pressure points.
DURABILITY YOU CAN TRUST - Backed by a decade-long warranty and rigorous testing, this mattress is built to support your sleep for years to come.
MEDIUM FIRM FEEL WITH BOUNCE - Classic Casper medium firmness delivers a responsive bounce that keeps you from feeling stuck, enhancing restful sleep.
EFFORTLESS SETUP EDGE SUPPORT - Unbox, watch it decompress, and enjoy firm edge support that makes getting in and out of bed seamless.

The Casper Sleep Original Foam Hybrid Mattress Queen combines premium memory foam layers with encased springs to deliver balanced comfort and targeted Zoned SupportTM for ergonomic spine alignment. Featuring breathable open-cell foam for airflow, a medium firm feel with responsive bounce, and a durable design backed by a 10-year warranty, this mattress offers a hassle-free setup and edge support for a superior sleep experience.

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