First night setup
Unbox and let it breathe for 4 hours
The pillow ships vacuum-compressed. After unboxing, the memory foam expands to roughly 80% within an hour and reaches full loft by hour 4. There may be a faint chemical smell for the first day or two — that's off-gassing from the compression seal and dissipates completely within 48 hours in a ventilated room. Use the pillow the first night anyway; the smell is harmless and most people don't notice it past hour 6.
Position the cervical wedge correctly
The pillow has a defined cervical wedge — a curved support that's higher on one end than the other. When lying on your side, the wedge end should be under your neck, not under your head. The lower side of the pillow should be under your head. This puts the spine in neutral alignment instead of bending it toward the mattress.
Use a body pillow or knee pillow with it
The cervical pillow positions your neck; a knee pillow positions your hips and pelvis. The two together produce the largest sleep-quality improvement for side sleepers. If you don't have a knee pillow, a folded sheet under one knee works for the first few nights.
The 21-night break-in
A new sleep position takes about three weeks to settle. During the first week you may notice the pillow feels "different" — stiffer, taller, oddly shaped. By week two your body has adjusted to the new alignment. By week three you'll wonder how you slept on a flat pillow for so long. If after 21 nights it still doesn't feel right, the pillow probably isn't for you — initiate a return with support@crestlinerest.com.
This usually means your jaw was previously pressing into a flat pillow and the muscle is adapting to the new freedom. Soreness for 3–5 days is common; soreness that persists past day 7 is not. Email us and we'll diagnose.
Washing the cover
The outer cover zips off completely. Machine-washable, cold water, gentle cycle, mild detergent. Do not use bleach. Bleach attacks the cooling thread in the cover and leaves a permanent yellow streak.
Dry low + slow
Tumble dry on the lowest heat, or air-dry on a rack. High heat warps the cooling fiber and shrinks the cover. Allow 60–90 minutes for full dry on low heat; 6–8 hours for air-dry.
Reattaching the cover
The cover goes back onto the foam easiest if you turn it inside-out, slide one corner of the foam into one inverted corner, then peel the cover over the foam. Zip closed last.
Cleaning the foam (rarely)
The foam core is sealed in a waterproof inner liner. Under normal use it never needs cleaning. If something gets through the cover and inner liner:
- Vacuum the surface to lift any solid debris.
- Wipe with a damp cloth and a drop of mild detergent. Don't soak.
- Sprinkle baking soda over the affected area, leave 30 minutes, then vacuum.
- Air-dry for 24–48 hours in a well-ventilated room before reassembling.
Never put the foam in a washing machine. Memory foam absorbs water by orders of magnitude more than ordinary fabric, and the spin cycle will tear the cell structure apart.
Storage between uses
If you're traveling without the pillow or storing it short-term, keep it loose (not vacuum-sealed) in a cotton pillowcase or breathable storage bag. Don't store in plastic — trapped moisture grows mildew.
Storing it long-term (more than a few months) at low loft: stuff the pillowcase with the pillow lying flat, never folded. Folded storage can permanently crease the cervical wedge.
The "do nothing" list
- The pillow taking 4 hours to expand on unboxing. Normal. Some pillows take 6 hours in cool rooms.
- The cover wrinkling slightly after washing. Hand-smooth before zipping back on. The wrinkles flatten under sleep weight within a few minutes.
- A slight imprint where your head sits. The foam contours to you; that's the point. Full recovery happens when you get up.
- A faint plant-based smell for the first week. The foam is made with bio-derived ingredients; some people detect this for a few days before it dissipates.
The cooling layer
The "night-sweat weave" is a knit cover with a phase-change cooling thread woven into the top surface. It draws excess heat away from your head and dissipates it into the surrounding air. The cooling effect is most noticeable in the first 30–45 minutes of sleep, when your body is shedding the heat accumulated during the day. After that, your head temperature stabilizes and the cooling effect becomes ambient — you notice it less, but it's still working.
The cooling thread is durable but can lose some efficacy if exposed to high dryer heat repeatedly. Use the lowest dryer setting always.
Questions?
If your pillow is doing something unusual and this guide didn't cover it, email support@crestlinerest.com with a photo and a sentence about what's happening.