Wellell Sedens 400 Lightweight Pressure Relieving Seat Cushion - 24-Hour Pressure Relief
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This cushion requires no electricity or pump for initial setup, making it perfect for home, travel, or clinical environments. The self-inflating design ensures it’s ready to use with minimal effort, offering convenience without compromising performance.

The Sedens 400 features a single-piece cushion design that combines foam encasement with six air cell-like chambers. This structure is engineered to reduce the risk of bottoming out while improving comfort and durability, especially during long sitting periods.

An easy-to-use air valve lets users adjust the immersion depth of the cushion. This allows for better control over pressure distribution, giving users the flexibility to fine-tune support according to their body type and comfort preferences.

The 4-way stretch cover promotes airflow and helps diffuse moisture, maintaining a dry and comfortable surface. This helps protect skin integrity and reduces the risk of skin breakdown, especially important for users with sensitive skin or limited mobility.

For users needing enhanced pressure management, the Sedens 400 can be connected to a compatible alternating pressure pump. This feature helps redistribute pressure at regular intervals, providing dynamic relief and reducing the risk of pressure ulcers over time.
The connector able to work with some of our air mattresses pump (Domus 3, Domus 4, Domus Auto & Procare series)


Lightweight & Portable: Easy to carry and perfect for wheelchairs, office chairs, or travel use.
Self-Inflating Design: No need for electricity or pumps—just open the valve and it's ready to use.
Hybrid Air-Foam Construction: Combines foam and air chambers to provide consistent pressure relief.
264 lbs Weight Capacity: Supports a wide range of users with reliable seating stability.
Bottoming-Out Protection: Single-piece cushion with six air cell-like structures minimizes the risk of sinking too low.
Adjustable Air Valve: Allows users to control immersion level for customized support and comfort.
4-Way Stretch Cover: Enhances moisture control and promotes airflow to protect skin.
Pump-Compatible Option: Can connect to an alternating pressure pump for dynamic pressure redistribution.
Designed for Pressure Injury Prevention: Helps reduce the risk of pressure sores and improves long-term sitting comfort.
| Feature | Specification |
|---|---|
| Maximum Patient Weight | 264 lb |
| Dimensions | |
| Length | 17.3" |
| Width | 16.1" |
| Height | 3.5" |
| Cells | 6 |
| Weight | 2.4 lb |
| Materials | |
| Top Cover Material | Poly/PU |
| Cell Material | Nylon/PU |
| Base Material | PVC |
Once your order is placed, you'll receive a confirmation email with the order details. This means we’ve received your order and are starting to process it.
Your payment method is pre-authorized at checkout. You’ll only be charged once we verify and prepare your order for shipment.
After you order, we confirm stock availability.
We’ll keep you updated by email, including tracking info once your item ships.
We understand that plans can change, and we’ll do our best to accommodate.
Within 24 hours of placing your order: Free cancellation.
Exception: If your order has already been processed a 25% restocking fee may apply even within the first 24 hours.
After 24 hours: A 25% restocking fee will apply, certain brands cannot be cancelled,
Custom orders: Cannot be canceled once processing has begun.
Please note:
Some orders are processed and paid immediately. If your order has already been processed or shipped, it cannot be canceled.
Refunds are only issued within 7 days of purchase.
Returns requested after 7 days, up to 14 days, are only eligible for an exchange and may be subject to a restocking fee.
All cancellations must be submitted in writing.
Pre-Orders
Please note that pre-orders are paid upfront to secure your item. While we always strive to meet the estimated shipping timelines, delays may occasionally occur due to factors outside of our control (such as manufacturing or supplier issues). Because pre-orders are reserved and allocated in advance, they are non-refundable. If a refund is requested, a restocking fee will apply.
Returns that require a refund are only accepted within 7 days of receiving your item. To qualify, the product must be unused, in its original packaging, and include all parts, accessories, and paperwork. Refunds are issued to the original payment method, minus shipping, handling, and restocking fees.
Returns for exchange are accepted within 14 days of receiving your item, subject to the following conditions:
Item must be unused, in original packaging, with all accessories and documents
A 25% restocking fee applies
Shipping costs (both ways) are non-refundable and the customer’s responsibility
Some products cannot be returned or refunded due to hygiene, customization, or manufacturer policies. These include (but are not limited to):
Please note that all sales are final. The following categories and brands are non-returnable and non-refundable:
Beds
Batteries and Chargers
All Lifts (including Residential and Vehicle Lifts)
Lift Chairs, Geri Chairs, and Patient Room Chairs
Mattresses
Mobility Accessories
Patient Lifts
Red Light Therapy Devices
Wheelchair Cushions and Support Surfaces
Slings
Vehicle Lifts
All products sold under the brand Discover Your Mobility (these items fall under all of the above non-refundable categories)
➡️ For the full list of non-returnable brands, please [click here].
If a product arrives defective or damaged, the manufacturer will offer a replacement at no cost to you. You must report the issue within 24 hours of delivery and return the defective item before a replacement can be shipped. A prepaid return label will be provided.
If you choose not to accept a replacement and instead request a return, the order will be treated as a standard return. In this case, the following applies:
A 25% restocking fee will be deducted
Shipping costs (both ways) are non-refundable and the customer’s responsibility
Damage not reported within 24 hours may not be eligible for a claim.
Large Freight Deliveries (Including the PLIFT by Discover Your Mobility)
Large freight deliveries are not usually returned to sender. They will be dropped off at the delivery address you provide.
You will be given tracking details to monitor your shipment.
We are not responsible for missed deliveries, as the freight carrier will leave the item at your address.
Returns to Sender
If an order is refused at delivery or otherwise returned to sender, a 25% restocking fee will apply.
You are also responsible for both outbound and return shipping costs in such cases.
All products are covered by the manufacturer’s warranty. Terms vary by brand. We can provide:
Proof of purchase
Warranty documentation
After the return period, warranty claims must be handled directly with the manufacturer. Where items cannot be repaired, the manufacturer will require the defective item to be returned before a replacement can be shipped.
We’re here to help — please contact us first to resolve any issues. Fraudulent chargebacks will be considered theft and pursued legally.
By placing an order, you acknowledge our return, refund, and delivery policies. These terms will be provided to your financial institution in the event of a dispute.
By purchasing from FirstClassMobility.com, you agree to the following:
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Disclaimer
All product specifications, including weights, dimensions, and battery ranges, are provided by the manufacturer and are intended as a general guide. Actual measurements may vary slightly due to manufacturing tolerances, optional accessories, or product updates.
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