Kore Short
Skip until brand discloses water-repellent coating treatment details.
Vuori Kore shorts are nylon/spandex. No public PFAS disclosure from brand; typical athletic shorts may use water-repellent coating finishes with PFAS history. Confirmation needed.
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Material
nylon/spandex blend
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Kore Short is made of, ingredients and materials
The Kore Short is a nylon/spandex blend, typical for athletic wear needing stretch and moisture-wicking. Nylon is a synthetic polymer that does not biodegrade quickly; spandex (polyurethane elastomer) adds elasticity. The manufacturing of both fibers can involve formaldehyde-based resins in finishing treatments, and synthetic textiles commonly use azo dyes in pigmentation. Neither material inherently contains heavy metals, but dye chemistry and finishing agents are the primary concern in this blend.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Formaldehyde / VOCs
Nylon and spandex blends commonly undergo formaldehyde-based resin treatments for wrinkle resistance, water repellency, or durability. Vuori has not disclosed whether such finishes are used on the Kore Short or what formaldehyde levels are acceptable, so exposure risk cannot be ruled out.
Source, ATSDR ↗Azo dyes
Synthetic textiles typically use azo dyes for color fastness. No public testing or certification limits azo-dye use in Vuori products, leaving a documented known hazard class unaddressed in this brand's disclosure.
Microfiber shedding from spandex degradation
Spandex elastomers degrade with washing and UV exposure, releasing microfibers into waterways and potentially ingested if worn during water activities. This is a lifecycle concern common to all synthetic-blend athletic wear, not unique to Vuori but relevant to this product.
PFAS
Athletic shorts marketed as water-repellent typically use water-repellent coating finishes. Vuori does not disclose whether fluorinated (PFAS-containing) or fluorine-free water-repellent coating is applied, a gap that contradicts the product's PFAS grade of 65/100 and the brand's silent stance on chemical transparency.
Source, ATSDR ↗Dye or finish allergenicity / skin sensitivity
Azo dyes and formaldehyde resins are known allergens and irritants. Without third-party testing (OEKO-TEX or equivalent) or brand disclosure, individual sensitivity risk cannot be assessed for this product.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
How is this PFAS grade calculated?
The brand's record and disclosure
Vuori does not publicly disclose water-repellent coating (water-repellent coating) treatment chemistry for its products, including whether fluorinated (PFAS-based) or fluorine-free finishes are used on athletic shorts. The brand has not published a restricted substances list, third-party certifications (such as GOTS or OEKO-TEX), or formaldehyde-release testing results. This silence on finishing chemicals is notable for a performance apparel brand and leaves the formaldehyde and azo-dye profile of this product unverified.
How it compares in its category
Nylon/spandex shorts are mainstream in athletic wear; this blend is not unusual. Competitors like Patagonia and Allbirds publish restricted-chemicals lists and water-repellent coating disclosures; Vuori's opacity stands out negatively. The lack of third-party certification (GOTS, OEKO-TEX) is a practical disadvantage when purchasing because you cannot independently verify chemical limits on finishing agents.
If you buy it
Wash in cold water and mild detergent to minimize azo-dye bleeding and reduce formaldehyde-resin off-gassing. Avoid high-heat drying; air dry or use low heat to preserve elasticity and limit chemical volatilization. Do not wear against sensitive skin if you experience rashes (possible azo-dye or formaldehyde sensitivity). Replace when elasticity fails or seams degrade, as worn spandex can shed microfibers.
What is not known about PFAS in this product?
- Basis
- Model estimate, 55% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Vuori has made none
Formulations change between production runs, so check the current label. How we grade.
More activewear grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.