Casper Original Hybrid vs Amerisleep AS4

The best way to feel the Casper Original Hybrid is to take advantage of our 100-night, risk-free trial. If you're looking for a mattress that can sustain more weight, or you want to be lifted more than cradled, then our hybrids are a great choice.

The AS4 is our medium-soft mattress. It offers plush comfort with targeted support that helps you sleep your best. Plus it stays cool all night, making it our most popular model with side sleepers.

Our signature design, now with springs for added support. Made with two layers of premium foam, plus foam-encased springs:

• Breathable Polyurethane Foam
• Zoned Memory Foam
• Durable Base of Polyurethane Foam with Encased Springs.

Three layer construction:

• Bio-Pur® foam
• HIVE® transition layer
• Bio-Core® foam support layer
• Refresh Cooling Cover.

A layer of Airscape™ perforated breathable foam increases airflow and circulates air so you don't get too hot at night.
Resilient springs add a little lift, support, and airflow to the mattress of your dreams.

Traditional memory foam is made from dense material, so it traps your body heat and can make you sweaty and uncomfortable while you're in bed - and who can sleep like that?
We developed our foam with an enhanced "open cell structure", which means there is more air space between the foam particles. That space wicks away heat while you sleep, and can keep you cooler and more comfortable.

Premium foam conforms to your body to relieve pressure.
Zoned Support™ provides a layer of memory foam with 3 ergonomic zones to help align your spine and provide more relief.
A firmer border provides edge support to help you get in and out of bed easily.

Our Bio-Core® foam support layer won't sag even after decades of use. And, like our Bio-Pur® foam, it's partially made from plants instead of petroleum so it's eco-friendly.
The HIVE® layer features hundreds of foam hexagons grouped into five comfort zones. Each zone is designed to provide extra cushion where you want it and support where you need it. That way your body gets the support it needs to stay properly aligned, so you can sleep your best.

Stay cool all night with the innovative cooling system. AirScape™:

• A top layer of perforated breathable foam helps reduce heat.
• Tiny holes move hot air and body heat away.

The HIVE® transition layer has precision-cut channels that carry away even more heat and moisture. It's enough to make you feel like you're weightlessly resting on a cloud.
Amerisleep's Bio-Pur® material features an advanced-open cell design. This makes Bio-Pur® more breathable and responsive than memory foam, which will keep you cool and comfortable all night. Plus we make Bio-Pur® from partially plant-based sources using a zero-emission process. That means it's the most eco-friendly material of its kind.

Get all-night comfort with the innovative support system. Zoned Support™:

• 3 zones of targeted support for proper spinal alignment.
• Softer foam around the shoulders provides more relief to the upper body.
• Firmer foam under the hips, waist, and lower back helps align your spine.

Bio-Pur® contours to your body to relieve pressure points and bounces back fast, so you won't feel "stuck" during the night.
Our HIVE® transition layer provides targeted support and pressure relief so you can sleep in perfect alignment. It gives your head, back, and legs more support, and your shoulders and hips more cushion.

Planet-friendly textiles. Up to 57 recycled bottles in each cover.

Refresh Cooling Cover
The Refresh Cover draws heat from your skin for a delightfully cool-to-the-touch feel. On average, your sleeping surface will stay 7 degrees cooler over an eight-hour night of rest compared to a traditional 100% polyester cover. This scientifically engineered fabric uses minerals to help convert your natural body heat into far infrared energy. This type of energy increases blood circulation to help speed up muscle recovery and improve quality of sleep.

Your order will typically arrive in 2-5 business days. We ship via UPS Standard from warehouse partners.

We provide standard free curbside shipping to anywhere in the contiguous USA. Mattresses ship as quickly as 3-5 working days (excluding major holidays) via FedEx, once shipped, delivery takes approximately 1-5 business days.