100% Organic Cotton Thermal Long Sleeve (Unisex)

A 100% organic cotton thermal long sleeve for anyone looking for a warm, breathable base layer without polyester or synthetic fibers. Made from undyed, unbleached cotton in its natural color, this unisex thermal shirt has a textured knit and a relaxed fit that's comfortable worn on its own or layered under sweaters, jackets, and winter clothing.

The cotton is left untreated, without added dyes or bleaching, and gradually softens with washing. Its natural cream color may vary slightly depending on the cotton harvest.

Materials

100% organic cotton

Natural color, undyed and unbleached. According to the manufacturer, the cotton undergoes no chemical treatments during textile processing.

Why we chose it

Finding a 100% organic cotton thermal shirt without synthetic fibers, dyes, or chemical finishes is surprisingly difficult. This one is made from minimally processed cotton, with no polyester, nylon, or elastane.

The manufacturer states that the fabric is untreated and free from added dyes, bleaching agents, and chemical textile finishes. Because it is undyed, no azo dyes are used in coloring the fabric. The absence of textile finishing treatments is particularly appealing for shoppers looking to avoid substances such as PFAS, formaldehyde-based finishes, and conventional dye treatments.

Fit + details

• Unisex, relaxed fit
• Long sleeves with textured thermal knit
• No polyester, nylon, or elastane
• Suitable for everyday wear and layering in cooler weather
• Fabric gradually softens with washing
• Model is 6'3" wearing size XL
• Not pre-shrunk; may shrink up to one full size after washing
• Garments are initially cut larger to account for expected shrinkage

Care

Machine wash cold on delicate, separately from dyed clothing, and tumble dry low. Expect some shrinkage after the first wash.