Why you can trust Thinx Inc. products

At its core, Thinx Inc. was founded to provide safe, comfortable, and sustainable options for people with periods and bladder leaks. Customer safety is important to us, and so is your trust. That’s why we’ll always be honest and transparent about how our products are made. From rigorous absorbency testing, to objective third-party tests of our finished products, here are all the steps we take to uphold the highest standards of product safety.

Our certifications and safety standards

All Thinx Inc. underwear are rigorously tested for harmful chemicals, and independently certified through STANDARD 100 by OEKO-TEX®, which includes REACH requirements [20.HUS.04850 | HOHENSTEIN HTTI]. This OEKO-TEX®️ certification means every component—from fabric to trim—is thoroughly tested and certified for ecological safety.

OEKO-TEX®️ certification badge. OEKO-TEX®️ confidence in textiles. Standard 100. 20.HUS.04850. HOHENSTEIN HTTI. Tested for harmful substances, www.oeko-tex.com/standard100.

What are Thinx Inc. products made of?

It might seem like magic, but every Thinx Inc. product has layered technology built into the gusset that makes it moisture-wicking, odor-controlling, and absorbent.

Underwear layers illustration

Underwear

Gusset

Gusset layers illustration

Gusset Layers

Body

  1. Moisture-wicking layer

  2. Absorbent layer

  3. Moisture-impermeable layer

Thinx

Gusset Components

Lightest

Light

Moderate

Heavy

Super

1. Moisture-wicking layer

Draws away wetness and neutralizes smells

95% Cotton / 5% Elastane

  • One-way moisture-wicking functionality that moves moisture from the surface of the fabric and transports it away from the body to the second layer.

Our heavy absorbency comes in 2 different fabrications for the gusset. Rest assured, both hold up to 4 regular tampons’ worth of flow.

If you purchased a heavy absorbency pair of Thinx, they may have a composition of 95% cotton / 5% elastane or 100% polyester.

To see which fabrics your undies are made of, check the hangtag on your pair.

100% Polyester

  • One-way moisture-wicking functionality that moves moisture from the surface of the fabric and transports it away from the body to the second layer.

2. Absorbent layer

Captures fluid in the gusset for all day dryness

96% Cotton / 4% Elastane

  • Single jersey fabric with moderate absorbency capacity, treated with a hydrophilic softener for moisture management.

96% Cotton / 4% Elastane

  • Single jersey fabric with moderate absorbency capacity, treated with a hydrophilic softener for moisture management.

100% Polyester Microfiber Terry

  • Thick terry fabric with greater absorbency capacity, treated with a hydrophilic softener for moisture management.

3. Moisture-impermeable layer

Prevents leaks and stays breathable

100% Polyester laminated with PU

  • Polyester material laminated with a polyurethane-based film.
  • This layer is moisture-impermeable and moisture vapor permeable for breathability.

100% Polyester laminated with PU*

  • Polyester material laminated with a polyurethane-based film.
  • This layer is moisture-impermeable and moisture vapor permeable for breathability.

100% Polyester laminated with PU

  • Polyester material laminated with a polyurethane-based film.
  • This layer is moisture-impermeable and moisture vapor permeable for breathability.

*Both versions of our heavy absorbency undies contain these fabrics.

Thinx Teens

Gusset Components

1. Moisture-wicking layer

Draws away wetness and neutralizes smells

100% Polyester

  • One-way moisture-wicking functionality that moves moisture from the surface of the fabric and transports it away from the body to the second layer.

2. Absorbent layer

Captures fluid in the gusset for all day dryness

100% Polyester

  • Thick terry fabric with greater absorbency capacity, treated with a hydrophilic softener for moisture management.

3. Moisture-impermeable layer

Prevents leaks and stays breathable

100% Polyester laminated with PU

  • Polyester material laminated with a polyurethane-based film.
  • This layer is moisture-impermeable and moisture vapor permeable for breathability.

Speax

Gusset Components

1. Moisture-wicking layer

Draws away wetness and neutralizes smells

100% Polyester

  • One-way moisture-wicking functionality that moves moisture from the surface of the fabric and transports it away from the body to the second layer.
  • Agion®, an EU regulated anti-odor treatment using non-migratory silver zeolite and silver copper zeolite, is also applied to this layer.

2. Absorbent layer

Captures fluid in the gusset for all day dryness

87% Polyester, 13% Polyamide

  • Double layer terry fabric with greater absorbency capacity, treated with a hydrophilic softener for moisture management.
  • Agion® is also applied to this layer.

3. Moisture-impermeable layer

Prevents leaks and stays breathable

100% PUL

  • Polyurethane material.
  • This layer is moisture-impermeable and moisture vapor permeable for breathability.

FAQs