What Manduka foam blocks are actually made of

Before choosing a disinfectant for any surface, you need to know what that surface is made of. It is the question most studio owners have never asked about their yoga blocks — and the one that explains why their equipment is deteriorating faster than it should.

Manduka’s foam yoga blocks — both the standard and mini sizes — are made from recycled EVA (ethylene-vinyl acetate) foam, containing between 50% and 75% recycled post-industrial and post-consumer content. The foam is high-density, which gives it the firm, stable support required for standing balance poses. The surface is closed-cell — meaning the outer layer does not absorb liquids, which is why Manduka markets it as easy to wipe clean.

That closed-cell structure is both the block’s strength and its vulnerability: it makes surface disinfection straightforward because pathogens cannot penetrate into the foam body. But the EVA polymer matrix itself — the chemical backbone of the foam — is sensitive to the solvents and oxidizers found in most common disinfectants. The right disinfectant cleans the surface and leaves the foam intact. The wrong one starts degrading the material the first time you use it.

What happens when you use the wrong disinfectant on EVA foam

EVA foam has a specific vulnerability: its plasticizer content. Plasticizers are the compounds that give EVA foam its flexibility, softness, and grippy feel. When alcohol-based solvents come into contact with EVA foam repeatedly, they extract these plasticizers from the polymer matrix — a process that is invisible at first and then suddenly very visible.

Alcohol-based wipes — the most common mistake

The research is specific and documented. Analysis of alcohol wipe effects on EVA foam confirms that repeated or aggressive use of wipes containing 70% isopropyl alcohol or ethanol causes EVA foam to stiffen, discolor, develop microfractures, and eventually crack — particularly along high-stress zones like edges, compressed areas, and the slip-resistant texture. Users report visible whitening, surface bloom, or brittle flaking after just three to five wipe-downs per week.

Bleach — the other common mistake

Sodium hypochlorite (bleach) degrades EVA foam through oxidation. Where alcohol extracts plasticizers, bleach attacks the polymer chain itself. Yoga Design Lab’s material guidance confirms that bleach and ammonia are too caustic for synthetic foams, stripping color and breaking down the molecular structure.

The disinfectant verdict — three options compared

What is actually living on your yoga blocks — and why it matters

Shared yoga and pilates equipment is a documented vector for multiple pathogens. A 2026 Wellness Living analysis found that nearly 75% of public exercise equipment tested positive for Staphylococcus aureus — the bacterium responsible for most MRSA infections. The warm, humid studio environment accelerates microbial growth between classes.

What researchers have confirmed on shared fitness and yoga equipment: MRSA, Staph aureus, E. coli, Salmonella, rhinovirus, RSV, influenza A, norovirus, Candida (ringworm), Trichophyton (athlete’s foot), Klebsiella, and Pseudomonas. Every one of these pathogens is killed by SONO Disinfecting Wipes at a confirmed contact time per the Formulation Data Sheet and EPA test guidelines.

Why SONO Disinfecting Wipes are the right choice for Manduka foam blocks

SONO Disinfecting Wipes (EPA Reg. #6836-340-89018) are formulated with a quaternary ammonium compound (QAC) base — the disinfectant chemistry class that research confirms provides exceptional material compatibility on foam and polymer surfaces without the plasticizer extraction associated with alcohol-based formulas or the oxidative damage caused by bleach and hydrogen peroxide.

The formula is alcohol-free and bleach-free by design. The same properties that make SONO safe for ultrasound probe housings, medical device plastics, and vinyl exam table surfaces make it the correct choice for EVA foam yoga and pilates equipment.

The studio protocol — how to disinfect Manduka blocks correctly