Polyester in Sportswear: What It Sheds, What It Costs, and the Plant Fibre Alternative
You already know polyester feels wrong on a hot day. That cling. That smell by afternoon. That film on your skin when you finally peel the top off. Your body was telling you something.
The First Set is Terra Bra plus Biker Shorts, sized separately, ₹4,999. Also The Longline Tank. No polyester. No nylon.
Polyester is basically plastic
Most activewear is petroleum fibre: polyester, nylon, elastane blends. Nylon is plastic too. It is marketed as performance. On your skin it behaves like wrapping yourself in a bag.
- Traps heat. Plastic does not breathe. India humidity has nowhere to go.
- Holds sweat against you. Odour builds. You shower. The top still smells by evening.
- Microplastics on skin. Polyester sheds plastic microfibres against your skin with every wash and wear. Published research has found microplastics in human blood. That is not a claim that fibres pass through pores, and it is not a disease claim.
You are not being dramatic. You are sweating with plastic pressed against your ribs, waist, and thighs, and it sheds plastic microfibres against your skin with every wash and wear.
Why we built WEARTH without it
We use eucalyptus plant fibre, not petroleum. It releases heat, manages moisture naturally, and stays soft without chemical wicking sprays. It feels closer to a fine cotton shirt than to gym plastic, but it moves and recovers like proper activewear.
The money went into the fabric. It is what you wear when you are done arguing with polyester on a hot day.
Start here: Non-synthetic activewear India, the complete polyester-free guide.
The First Set, ₹4,999. Tags on for 30 days. Courier pickup.
Category map: Best non-toxic workout clothes India 2026.
Updated October 2026. WEARTH activewear is 93% to 95% eucalyptus plant fibre with 5% to 7% elastane. It is not plastic-free. There is no plant-based stretch fibre at commercial scale.