Ingredient

Spandex (5%)

Neutral in 9 Flagged in 2

What is Spandex (5%)?

Spandex, also known as elastane or Lycra, is a synthetic fiber renowned for its exceptional elasticity. It is produced through a complex chemical process involving the polymerization of a polyester-like substance with polyurethane.

Spandex is widely used in the textile industry, especially in clothing that requires stretchability, such as leggings and bras. The primary health concern with spandex is related to skin sensitivity or allergic reactions in rare cases; however, it is generally considered safe for most people. Due to its elasticity, it provides comfort and a snug fit in stretchable garments.

Commonly found in: Leggings, Bras, Swimwear, Activewear, Compression Garments, Underwear

What to watch

Some people may experience skin irritation or allergic reactions when it comes in direct contact with the skin.

Benefits

Spandex enhances garment flexibility, providing comfort and ease of movement.

FDA

Spandex is not a food or cosmetic ingredient and is not regulated by the FDA in terms of ingestion or topical application.

Research

Research on spandex primarily focuses on its physical properties and applications in textiles rather than health effects.

Vegan

Spandex is not derived from animal products and is generally considered acceptable for vegan lifestyles.

Sources: Spandex, What is Spandex?

Scout's take

The 5% spandex is what gives the tank its stretch and lets the shelf bra hold its shape, and 5% is the practical floor for that in a supportive knit. In a GOTS-certified, PFAS-free construction with no polyester or nylon, this small share is a functional necessity rather than a source of exposure.

More from Scout's analyses

The 5% spandex is what gives the fabric its stretch and recovery. In a GOTS-certified knit with no polyester or nylon anywhere in it, this share is a functional necessity rather than a source of exposure.

from the analysis of Bota Organic Cotton Shorts

Synthetic polyurethane stretch fiber adding further plastic leaching risk.

from the analysis of UNIQLO Leggings

Processed additive flagged under Scout's ingredient doctrine.

from the analysis of Hanes Originals T-Shirt Underwire Bra