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- USA
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- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 6 - Jul 11
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Description
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500Weve evolved the Serta iSeries NXG to be the next generation of comfort. We've built this Medium feel mattress with a series of benefits for the sleep you want. Experience immediate cooling, instant pressure relief, and ideal support for a deeper , more restful sleep at a price that makes sense. Featuring high density memory foam, NXG Memory Foam delivers deep, contouring pressure relief. A cool to the touch fabric oers instant cooling, while Carbon
We’ve evolved the Serta® iSeries NXG™ to be the next generation of comfort. We've built this Medium feel mattress with a series of benefits for the sleep you want. Experience immediate cooling, instant pressure relief, and ideal support for a deeper , more restful sleep at a price that makes sense. Featuring high-density memory foam, NXG™ Memory Foam delivers deep, contouring pressure relief. A cool-to-the-touch fabric offers instant cooling, while Carbon Fiber Memory Foam draws heat away from the body for all-night comfort. Plus, a dense foam core provides durable support.iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - Twin Long
39.0"W x 79.5"D x 13.5"H - 94.62 lb
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - Full
54.0"W x 74.5"D x 13.5"H - 120.11 lb
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - Queen
60.0"W x 79.5"D x 13.5"H - 140.01 lb
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - Split Head Queen
60.0"W x 79.5"D x 13.5"H - 141.25 lb
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - King
76.0"W x 79.5"D x 13.5"H - 175.69 lb
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - Split Head King
76.0"W x 79.5"D x 13.5"H - 174.56 lb
iSeries NXG - 13.5" Memory Foam Medium Mattress 3500 - California King
72.0"W x 83.5"D x 13.5"H - 174.95 lb
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 1225 reviews
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Product Reviews
★★★★★ 5
My favorite
Size: Medium, Color: Opal Blue/White/Cruise Blue (3-pairs)
My favorite socks, too bad under armour discontinued the cotton blend fabric and went to 100% polyester 😠
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Reviewed in the United States on March 16, 2026
★★★★★ 5
Comfortable
Size: 6-10, Color: Halo Gray/Assorted
These are my favorite socks!
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Reviewed in the United States on September 22, 2025
★★★★★ 5
LOVE THEM!!
Size: Small, Color: (001) Black / Black / Castlerock
LOVE! These socks are so comfortable! I wear a 5 in women's and a 3 in big kid shoes. The small fit me perfectly. I see where some say they run small but I can't say that was an issue for me. They are "snug" but thats what you want with a no show sock. I feel they have support vs the ones i used to buy at Walmart. They are very soft! I am actually buying more today and throwing my other ones in the trash!
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Reviewed in the United States on February 18, 2026
★★★★★ 5
So will not write down your foot
Size: Medium, Color: (001) Black / Black / Castlerock
I love these socks. They have a little bit of gel on the top of the heel for support in your tennis shoes and so your socks don’t write down. Very good quality.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Comfy and Stay Put
Size: Medium, Color: (002) Black / Black / Halo Gray
These socks are honestly great. They’re super thin and light, so once you have them on, you kind of forget they’re even there. No bulky feeling in your shoes at all.
The best part is they actually stay on. I hate no-show socks that slide down after five minutes, and these don’t do that. The little grip on the heel really works, so you’re not constantly adjusting them all day.
They’re breathable too, which is nice if your feet run warm. They dry fast and don’t get that gross sweaty feeling. And there’s no annoying seam on the toe, so nothing rubs or feels uncomfortable.
Basically, they’re just comfy, stay put, and don’t cause problems — which is all I want from socks.
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Reviewed in the United States on January 16, 2026