What Science Says About Synthetic Underwear

(Studies Breakdown & Our Solution)

Over 65% of clothing today is made from synthetic fabrics (petroleum-based plastics like polyester). In underwear, it’s even worse.

Here’s what leading universities, government agencies, and independent laboratories have found about what you’re really wearing.

Sweat Leaches Toxic Chemicals from Synthetic Clothing

What They Found:

Human sweat leaches toxic chemicals from microplastics in synthetic fabrics
8% of flame-retardant chemicals absorbed through skin in 24 hours
"Sweatier" skin absorbed even higher levels
Polyethylene (PE), the same plastic in synthetic clothing was the primary culprit

Why It Matters:

Synthetic underwear traps heat and moisture for 16+ hours a day
Sweat + plastic = direct pathway for toxins into your bloodstream
Linked to endocrine disruption, neurotoxicity, and cancer

Study Link

Source: Peer-reviewed studies, Environmental Science & Technology and Environment International, University of Birmingham, 2023/2024

Microplastics Found in Human Testes

What They Found:

Microplastics present in 100% of human testes tested
Mean microplastic levels: 328.44 µg/g
Polyethylene (PE) from synthetic clothing was the dominant polymer

Why It Matters:

Microplastics accumulate in reproductive organs
Impact on sperm quality and male fertility
What you wear affects your reproductive health

Study Link

Source: Peer-reviewed study, Toxicological Sciences (Oxford University Press), 2024

700,000 Microplastic Fibers Released Per Wash

What They Found:

A single load of synthetic laundry releases over 700,000 microfibers
Wastewater treatment can't capture them all
500,000 tons of microfibers enter oceans every year from clothing alone
Polyester and acrylic fabrics shed the most

Why It Matters:

These fibers enter rivers, oceans, and the food chain
Can be breathed in and lodge in lung tissue
Accumulate in human organs, including reproductive tissue

Study Link

Source: Peer-reviewed study, Marine Pollution Bulletin, 2016

PFAS "Forever Chemicals" in Textiles

What They Found:

The textile sector accounts for 35% of global PFAS demand
PFAS are added to fabrics for water and stain repellence
These chemicals gradually leach out during use, washing, and disposal
Extremely persistent, they don't break down naturally

Why It Matters:

PFAS accumulate in ecosystems and human bodies over time
Linked to immune system effects, hormone disruption, and cancer
"Forever chemicals" mean forever exposure

Study Link

Source: European Environment Agency Briefing, 2024

The Carbon and Environmental Cost of Polyester

What They Found:

60% of global clothing is now synthetic (plastic-based)
Polyester production generates 2–3× more CO₂ than cotton
70 million barrels of oil used to make polyester in 2022
Polyester doesn't biodegrade: synthetic textiles = 35% of ocean microplastics

Why It Matters:

Massive carbon footprint accelerating climate change
Persistent plastic pollution that never breaks down
Every synthetic garment adds to the problem

Study Link

Source: United Nations Regional Information Centre, 2024

The CEDR Solution

That's Why We Use 100% Natural Fabrics

Every product at CEDR is made from purely natural fibers. No polyester. No nylon. No spandex. No forever chemicals.

All materials meet OEKO-TEX® Standard 100, Class I, the strictest category, suitable for babies.

Material Breakdown

RWS Merino Wool

RWS-certified, non-mulesed merino wool (animal welfare assured)
No superwash or synthetic treatments, just pure, untreated wool
Dyed using low-impact dyes that meet very strict safety standards
Naturally antibacterial and temperature-regulating

Used in: Everyday Boxer, Sport/Travel Brief

GOTS Organic Cotton

GOTS-certified organic cotton (traceable, independently audited)
No pesticides or synthetic chemical treatments
Dyed using low-impact dyes approved under GOTS standards
Breathable and hypoallergenic, commonly recommended for sensitive skin

Used in: Sleep Boxer (blended with linen),Sensitive Skin Boxer (undyed)

European Flax Linen

Sourced from European-grown flax
Naturally moisture-wicking without synthetic finishes
Dyed using low-impact dyes that meet very strict skin-safety standards
Highly breathable and ideal for warm climates

Used in: Sleep Boxer

Mulberry Silk

100% mulberry silk sourced from China, where silk production has been refined for thousands of years
Made from long, continuous silk fibers for purity and strength
Dyed using low-impact dyes that meet very strict skin-safety standards
Naturally smooth, breathable, and gentle on skin

Used in: Mulberry Silk Boxer