should I put the mattress pad over or under this pad?

We recommend putting the mattress pad over the topper.

does anybody use this topper upsidedown? so that the flat side is up and the egg carton divots face down?

In a hospital setting. The flat side is on the bottom. Allows air to circulate. Would be interesting to hear from the manufacturer says. I’ve had one of these in the past. I out a thin mattress pad down on the bare mattress, then this egg crate topper, then a heavy mattress pad, then the sheets. It was wonderful.

I have a xl twin. will the twin fit?

it should be fine, you will have a few inches at the head or feet with no topper, shouldn't be a problem. you only need it under your body . these things are pretty versitile, i have a twin bed and ordered a king, folded it in half, and put it inside a twin mattress protector to hold it all together. i had to cut a little of the lenghth but it is easy to cut with shears. i put the part i cut off in a pillowcase for my dog.

What is the length and width

Blessedxu you are wrong about the size of the Mattress it is 30 Inches WIDE

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🛏️ Compact comfort, big dreams—sleep smart, live better!

EFFORTLESS SETUP - Arrives vacuum-sealed and rolls out to full size within 72 hours—no heavy lifting required.
FRESH CLEAN SLEEP - Green tea infusion naturally neutralizes odors, keeping your sleep environment fresh night after night.
SPACE SAVVY COMFORT - Perfectly engineered for bunk beds, trundles, and RVs where every inch counts.
CONFIDENCE IN QUALITY - CertiPUR-certified, fiberglass-free, and backed by a 10-year limited warranty for peace of mind.
PRESSURE RELIEF TECHNOLOGY - Multi-layer foam cradles your body, reducing pressure points for deeper, restorative rest.

The ZINUS Memory Foam 5 Inch Narrow Twin Mattress is a space-optimized, green tea-infused memory foam mattress designed for smaller bed frames like bunk beds and RVs. It features breathable, pressure-relieving foam layers wrapped in a moisture-resistant cover, ships compressed in one box for easy delivery, and supports up to 500 lbs with a 10-year warranty—offering affordable, certified quality sleep tailored for compact living.

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¥146299

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Brand	Zinus
Model Number	AZ-FMS-5N
Colour	White
Product Dimensions	190.5 x 76.2 x 12.7 cm; 5.77 kg
Maximum Weight Capacity	500 Pounds
Material	Memory Foam
Special Features	Breathable, Durable, Pressure Relief
Item Weight	5.77 kg

ZINUS Memory Foam 5 Inch Narrow Twin Mattress

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