REI Co-op Diamond T-Shirt
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The REI Co-op Diamond T-shirt, made with organically grown cotton and recycled polyester, is appropriate for all social settings, as well as for sweating your way up switchbacks.
Shop similar productsKey Details
- The diamond logo first appeared on REI tents used by the successful U.S. 1978 K2 expedition
- Printed image is as soft as the shirt, so you can see it but not feel it
- Made to reflect our love for people and the planet, including the use of organically grown cotton, which has a lower environmental impact than conventionally farmed cotton
- Using recycled materials helps keep waste out of landfills
- Made using bluesign®-approved materials, which conserve resources and minimize impacts on people and the environment
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
- Made in a Fair Trade Certified™ factory
- Contains materials that meet the bluesign® criteria
Best Use | Casual |
---|---|
Shirt Type | T-shirt |
Fabric | 50% organically grown cotton/50% recycled polyester (bluesign® approved) |
Sleeve Length | Short Sleeve |
Hood | No |
Gender | Unisex |
Weight | Unavailable |
Sustainability | Contains recycled materials Contains materials that meet the bluesign® criteria Contains organically grown fibers Fair Trade Certified™ factory From a Climate Label Certified brand |
XXS | XS | S | M | L | XL | XXL | XXXL | 4XL | 5XL | XS Short | S Short | M Short | L Short | XL Short | XXL Short | XXXL Short | M Tall | L Tall | XL Tall | XXL Tall | XXXL Tall | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chest | 32 | 33 - 35 | 36 - 38 | 39 - 41 | 42 - 45 | 46 - 49 | 50 - 53 | 54 - 57 | 58 - 61 | 62 - 65 | 33 - 35 | 36 - 38 | 39 - 41 | 42 - 45 | 46 - 49 | 50 - 53 | 54 - 57 | 39 - 41 | 42 - 45 | 46 - 49 | 50 - 53 | 54 - 57 |
Sleeve Length | 30.5 | 30.5 | 31 | 31.5 | 32 | 32.5 | 33.25 | 33.5 | 33.5 | 33.5 | 28.75 | 28.75 | 29.25 | 30.25 | 30.75 | 31.5 | 31.75 | 34.75 | 34.75 | 35.25 | 36 | 36.25 |
Waist | 25 | 26 - 28 | 29 - 31 | 32 - 34 | 36 - 38 | 40 - 42 | 44 - 46 | 48 - 50 | 52 - 54 | 56 - 58 | 26 - 28 | 29 - 31 | 32 - 34 | 36 - 38 | 40 - 42 | 44 - 46 | 48 - 50 | 32 - 34 | 36 - 38 | 40 - 42 | 44 - 46 | 48 - 50 |
Hip | 34 | 35 - 36 | 37 - 38 | 39 - 40 | 41.5 - 43.5 | 44.5 - 47 | 48 - 51 | 52 - 55 | 56 - 59 | 60 - 63 | 35 - 36 | 37 - 38 | 39 - 40 | 41.5 - 43.5 | 44.5 - 47 | 48 - 51 | 52 - 55 | 38 - 40 | 41.5 - 43.5 | 44.5 - 47 | 48 - 51 | 52 - 55 |
Inseam | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 27.5 | 27.5 | 27.5 | 27.5 | 27.5 | 27.5 | 27.5 | 35 | 35 | 35 | 35 | 35 |
Sizing Notes
Measurements are stated in inches. Size chart values represent body measurements, not garment measurements.
Inseam is measured to the floor.
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.

