Best Spenco Polysorb Cross Trainer Insoles Review 2024

Quick Verdict

The Spenco Polysorb Cross Trainer insoles deliver genuinely impressive shock absorption and a comfortable arch profile that holds up well under sustained athletic use. After three weeks across trainers, hiking boots, and work clogs, I can say they earn their price tag — though the higher arch height means they're not a universal fit for every foot type. Score: 4.4/5

What Is the Spenco Polysorb Cross Trainer?

These are drop-in replacement insoles designed for cross trainers, running shoes, hiking boots, and other athletic footwear. Spenco, a brand that's been making foot comfort products since 1967, built the Polysorb Cross Trainer around their proprietary Spencore cushioning material — a 5/32-inch foam layer that sits under the heel and absorbs impact before it travels up your leg. The upper layer uses a 4-way stretch fabric that moves with your foot rather than bunching against it.

The Polysorb line sits in the middle of Spenco's range — more cushioned than their everyday Total Support line, but not as rigid as their Performance Plus model with the carbon fiber plate. You get a Polysorb polyurethane foam arch support underlayer, an EVA forefoot cushion, and that signature Spencore heel plug. They come in a handful of sizes covering both Men's and Women's ranges, with factory trim lines if you need a custom fit.

Key Features

• 5/32-inch Spencore material layer absorbs shock and impact through the heel
• 4-way stretch fabric upper resists bunching and helps prevent blisters
• Polysorb polyurethane foam arch support for sustained standing and movement
• EVA forefoot cushion adds energy return during jumping and lateral drills
• Spencore heel plug specifically targets heel-strike impact
• Odor-controlling properties in the fabric layer
• Approximately 3/4 length — fits most athletic and work shoes

Hands-On Review

I dropped these into a pair of well-worn cross trainers on a wet Tuesday morning and wore them to a 45-minute circuit class. That first session was telling: the Spencore heel plug took the edge off box jumps in a way I didn't expect from a non-custom insole. By the third set of burpees I wasn't nursing my heels the way I usually do.

By the end of the first week I'd rotated them into my hiking boots for a weekend trail walk carrying a loaded pack. Here's what surprised me: the arch support didn't feel intrusive at first — it kind of sneaks up on you. Around the two-hour mark my feet felt noticeably less fatigued than they typically do in those boots with their stock insoles. The 4-way stretch fabric genuinely stayed put; no hot spots, no friction seams cutting across my arch.

Into week two I tried them in my work clogs — not the ideal shoe, but a real-world test of versatility. The Polysorb insoles handled a 7-hour shift on a tile floor better than I anticipated. The arch support held firm without creating pressure points, and the shock absorption showed up most noticeably when I was pacing between the stockroom and the floor all day.

The only hiccup came when I lent them to a coworker with flat feet. The arch sat too high for her — she felt it pressing uncomfortably after twenty minutes. That arch height is real, and it's a meaningful consideration depending on your foot structure. I'll keep using these, but with the caveat that they lean medium-to-high arch rather than neutral.

Who Should Buy It?

• Athletes and gym-goers who log high-impact sessions — box jumps, deadlifts, running — and need reliable heel and forefoot cushioning without an orthotic prescription.
• People who stand all day on hard surfaces — nurses, retail workers, warehouse staff — and want more comfort than their stock shoe insoles provide.
• Hikers and trail walkers who want arch support that doesn't quit after a few miles; the Polysorb foam maintains its structure well under load.
• Runners transitioning to cross training who want something versatile enough for both cardio and lifting without swapping insoles.

Skip these if you have genuinely flat feet or require a low-profile, firm orthotic — the Spenco Polysorb's arch height and softer cushioning will likely frustrate you. Also skip if you're looking for medical-grade plantar fasciitis correction; this is a comfort and support insole, not a therapeutic device.

Alternatives Worth Considering

• Superfeet Green — Firmer arch, more aggressive structure. Better if you want maximum control over pronation and don't need as much cushioned give under the heel. More of a dedicated orthotic feel.
• PowerStep Pinnacle — A strong arch support option with a top fabric layer. Tends to be slightly narrower, making it a better fit for some shoe shapes. Comparable shock absorption but a different arch geometry.
• Spenco Total Support Original — Stiffer and more structured, with a narrower arch profile. Better for people who want that orthotic-like rigidity without going full custom.

FAQ

Final Verdict

The Spenco Polysorb Cross Trainer insoles strike a satisfying balance between cushioning and support — they're not the firmest arch solution, and they're not trying to be. What you get instead is a comfortable, durable insole that handles the kind of punishment that destroys most stock inserts. The 4-way stretch fabric and Spencore heel plug work exactly as described, and the build quality holds up over weeks of real use.

The arch height is the biggest variable — high-arch folks will probably love these; flat-footed shoppers should try them in-store or budget for a return. At their price point they compete well with Superfeet and Powerstep while offering a softer ride that many athletes prefer. For anyone spending serious time on their feet in athletic shoes, these are worth a look.