ONNO

Good T-Shirts for the World®

ONNO manufacturers no-frills T-shirts made with eco-friendly fibers that fit and feel great. With cotton, bamboo, and hemp options available, there is a T-shirt for everyone.

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Based in: Boulder, CO
Founded: 2006
Organic options: Available

About ONNO

For us, good t-shirts mean starting with fibers which are sustainably grown – bamboo, hemp, organic cotton. ONNO t-shirts are made in small, family-owned production environments where people are treated well. ONNO buys carbon offsets to balance the harm we do by moving t-shirts from here to there. ONNO’s home in Boulder, Colorado provides the setting where we continuously work to make you happy by creating the best t-shirt we can.

Materials & certifications

Materials

Cotton

A soft, breathable, absorbent, and versatile natural fiber grown from the fluffy bolls of cotton plants.

Good to know: Conventional cotton is one of the world's dirtiest crops as cultivation heavily relies on pesticides, herbicides (glyphosate), and fertilizers, raising concerns about environmental pollution, soil health, and potential health risks for farmers and consumers. This is why some brands and consumers push for "100% organic cotton." Organic cotton skips the harsh chemicals, making it a more eco-friendly and healthier choice.

Find brands using cotton →

Hemp

A versatile and durable natural fiber derived from the long, tough stalks of the Cannabis sativa plant known for its durability, sustainability, and moisture-wicking properties.

Uses: Commonly used in clothing (shirts, dresses, jeans, jackets), home textiles (curtains, rugs, towels), bedding (sheets, duvet covers), paper products, construction materials, upholstery, cushions, and even furniture frames.

Good to know: Hemp cultivation requires minimal pesticides and herbicides, and it returns 60-70% of the nutrients it takes from the soil. Hemp fabric also offers UV protection and has antimicrobial properties, making it a healthy choice for skin.

Find brands using hemp →

Lyocell

A regenerated cellulose fiber derived from wood pulp, often eucalyptus, beech trees, or bamboo. This material possesses a soft, comfortable feel similar to cotton yet exhibits superior strength and durability, even when wet.

Uses: Commonly used in clothing (shirts, pants, dresses, underwear), bedding (sheets, towels, blankets) home textiles (curtains, tablecloths, etc.), and various industrial applications.

Good to know: Unlike conventional viscose or rayon, the production of lyocell uses a closed-loop system that recycles most of the solvents, minimizing environmental impact and chemical exposure. Furthermore, in comparison to other cellulose-based fabrics, lyocell uses significantly fewer and less harmful chemicals during processing. For example, in most cases, the wood pulp is dissolved in a non-toxic organic solvent, N-methylmorpholine N-oxide (NMMO), to create a solution. This solution is then extruded through fine openings to form filaments, which are solidified into fibers.

Find brands using lyocell →

Certifications

GOTS
Textiles with this certification must contain at least 70% organic content and meet comprehensive ecological and social criteria. Notably, GOTS encompasses the entire supply chain, from the sourcing of fibers to the final stages of processing, manufacturing, and distribution. The label can be granted to entire brands or individual fabric suppliers and manufacturers.

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