1. Support Where Your Back Curves
Your lower back naturally curves inward. If the seatback doesn’t meet that curve, it can leave a gap right where you want support, even when you’re leaning back in the seat.
That’s why OrthoBase’s raised back is designed to meet that inward curve, giving your lower back a cushioned surface to rest against throughout the drive.
“I have used seat cushions before, but the seat back provides a whole new level of support and comfort.”
2. A Cutout Designed for Your Tailbone
When your tailbone is already sore, pressure from sitting can make a long drive uncomfortable. OrthoBase’s central cutout is designed to leave space beneath that sensitive area, with cushioning around the opening to support you.
Softness isn’t the same as space
A cushion can feel soft and still have padding directly beneath your tailbone. OrthoBase’s cutout leaves that area open, with cushioning around it designed to support you and help reduce direct pressure.
“Had broken my tailbone due to a snowmobile accident and with this, I am able to sit for longer periods of time, as it has the opening for the tailbone, so there’s no pressure on the tailbone.”
3. Will I Still Be Able to See the Road?
Comfort starts with a sitting position that works for you. With OrthoBase in place, adjust your seat so you can see clearly, reach the pedals comfortably and keep enough room above your head.
For a comfortable fit in your RAV4, Spruka recommends OrthoBase for drivers under 6′2″ and under 240 lb.
4. What You Actually Sit On
OrthoBase’s soft memory foam is designed to contour around your hips and butt as you sit, giving you a cushioned feel that follows your shape. Paired with a soft, smooth cover, it brings a little cloud-like comfort to the seat you use every day.
“This memory foam is supportive without being too firm... I weigh 273 pounds, and I am happy to say that the cushion provides excellent support without flattening out.”
Sources & editorial notes
Product information comes from Spruka. Illustrations show shape and intended positioning, not measured pressure or fit.
- OrthoBase product page and illustration
Source for the product image, shape and current details.
- Spruka's 60-day money-back guarantee
Use OrthoBase daily for 60 days. Full refund, no questions asked. See Spruka’s refund policy for how to request one.
- RAV4 seat and cushion illustration
Illustration of intended positioning. Not a measured seated-height or visibility test.
- Tailbone-area cutaway illustration
Conceptual illustration showing the tailbone area and central opening. It is not a measurement of fit or pressure.
- Grid-style cushion and OrthoBase comparison
Shape illustration comparing a grid-style cushion with OrthoBase. Not a comparative performance or measured-size test.
- Mayo Clinic: Back pain - Symptoms and causes
General sitting-posture guidance published September 26, 2024. The quoted passage describes the typical lower-back curve. The article does not evaluate OrthoBase.
- Lower-back support comparison illustrations
Illustrations of sitting positions with and without OrthoBase. Labels and colors are illustrative, not measured pressure or clinical outcomes.
- Austin W. review published on Spruka
Five-star review dated August 1, 2026, published on Spruka’s website. Describes the reviewer’s own experience after a tailbone injury, not a RAV4-specific result.
- Barry N. review published on Spruka
Five-star review dated July 13, 2026, published on Spruka’s website. Describes the reviewer’s experience in computer chairs, not a RAV4-specific result.
- OrthoBase foam and cover illustration
Product illustration. Not a physical foam test or measurement.
- Jonathan O. review published on Spruka
Five-star review dated August 1, 2026, published on Spruka’s website. Excerpt shortened with an ellipsis. Describes desk use, not a RAV4 installation.