Description
400SX Super Waveless Hardside Waterbed Mattress — S-Class Series
What is a Hardside Waterbed? A hardside waterbed uses a rigid wooden frame that the water bladder sits inside directly. It has the classic, traditional waterbed look and feel. Unlike a softside waterbed — which fits inside any standard bed frame — a hardside requires a dedicated waterbed frame.
This listing is for the bladder only. Hardside cover systems are available separately and can enhance comfort and protect your bladder — but they are not required for use with a hardside waterbed frame.
400SX Specs
- Series: S-Class
- Wave Level: Super Waveless — 2nd most waveless overall
- Construction: Seven comfort layers including three lumbar support layers and tethered wave control
- Best For: Sleepers who prioritize back support and near-zero motion transfer
Warranty — S-Class Series
Covers seam and valve related leaks from date of purchase:
- Years 1–5: Full replacement (excluding shipping)
- Lifetime: Pro-rated/discounted replacement (excluding shipping)
Optional Hardside Cover Systems
A cover system adds a quilted top and safety liner to your hardside setup. All include a safety liner:
- Factory Select Hardside Waterbed Mattress Cover
- Plush Top with Quilted Belgium Damask
- Belgium Damask Pillowtop
Recommended Accessories
Hardside vs. Softside — What’s the Difference?
- Hardside (this product): Bladder sits inside a dedicated wooden waterbed frame, traditional look, classic wave feel
- Softside: Foam-encased, fits any standard bed frame, looks like a regular mattress, easier to move
*Hardside frame, heater, fill & drain kit, and conditioner sold separately.
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