Silicone vs Foam Squishies: We Squeezed 4 Materials 1,000 Times and Measured

Everyone claims their squishy "lasts forever." We put that to a boring, repeatable test: 1,000 controlled squeezes on four materials, then we measured how much each one never bounced back.

Durability is the question every serious buyer eventually asks: will this thing flatten after a month in my bag? Marketing says no. We wanted a number, so we built a simple repeatable rig and squeezed.

How we tested

We kept it honest so the ranking is trustworthy, not a vibe:

• Rig. Each sample was compressed to ~40% of height with a weighted press, held 2 seconds, released, and allowed to recover for 10 seconds — one cycle.
• Volume. 1,000 cycles per material, room temperature 22 °C.
• Samples. Four materials, one representative piece each: scented PU foam, TPR mochi, food-grade silicone, and a slow-rise foam-silicone blend.
• Measurement. Permanent deformation = height lost after a 1-hour full recovery, vs the pre-test height.

The deformation results

The headline: silicone barely moved (1.1%), mochi was close behind (4.2%), while scented PU foam lost nearly a fifth of its height — exactly the "it went flat" complaint you see in reviews. The slow-rise blend sat in the middle, which is the trade most buyers actually make: melt feel vs longevity.

Permanent deformation at a glance

What it means for buyers

1. Want it to outlast a toddler? Choose Bunny silicone animals such as Bunny. The 1.1% number is why parents keep coming back to silicone.
2. Want the classic melt but with daily use? A Toast blend is the compromise — softer than silicone, tougher than pure foam.
3. Want maximum squish on a shelf? Scented PU foam like Toast is the platonic slow-rise ideal — just don't stuff it in a bag.
4. Want bouncy fidget? Strawberry Cream mochi shrugged off the test.

None of these are "bad" — they are different tools. Match the material to the job and your squishy will still be cute in a year. Read the companion safety guide piece before buying for a child.