We make athletic shirts from both fabrics, so this is not a takedown of one in favor of the other. Bamboo viscose and merino wool are the two best natural answers to polyester, and they solve slightly different problems. This comparison covers how each one feels, performs, and holds up, so you can pick the right shirt for how you actually live.
The short answer
Choose bamboo if you want the softest, lightest, most affordable everyday tee, especially in warm weather. Choose merino if you want maximum odor resistance, a wider temperature range, and a slightly more substantial fabric that dresses up cleanly. Many of our customers end up with both: bamboo for summer training, merino for travel, cooler months, and long days.
Softness and feel
Bamboo viscose is famously soft, with a silky, featherweight feel that disappears on the skin. It is the reason first-time customers describe our Fundamental Tee as the softest shirt they own. A merino and lyocell blend feels different: still buttery, but with more body and structure. At 180 GSM, our Merino Blend Tee drapes like a premium heavyweight tee rather than a featherweight one.
Odor resistance
Both fabrics resist odor naturally, and both beat polyester by a wide margin. Merino is the stronger of the two. The fiber actively binds odor molecules, which is why thru-hikers wear the same merino shirt for days. If your priority is wearing a shirt from a morning workout through an evening out, merino is the pick.
Temperature range
Bamboo excels in heat. It is light, airy, and quick to release warmth, which makes it ideal for summer sessions and high-output training. Merino regulates in both directions: warm when it is cold out, cool when it is not. If you run cold, travel between climates, or want one shirt for the whole year, merino covers more ground.
Durability and care
Both fabrics hold up well when washed cold and hung to dry, and neither should ever see a hot dryer. The lyocell majority in our merino blend adds durability that pure wool garments lack. Care for both is identical and simple; see our care instructions.
Side by side
| Property | Bamboo viscose | Merino + TENCEL blend |
|---|---|---|
| Feel | Featherweight, silky | Substantial, buttery |
| Odor resistance | High | Highest |
| Best temperature range | Warm weather | All seasons |
| Moisture wicking | Excellent | Excellent |
| UPF sun protection | UPF 50+ | Not rated |
| Weight | Light | 180 GSM midweight |
| Price (Kane) | $25 to $40 | $50 to $60 |
Frequently asked questions
Which is better for the gym? Both wick sweat and resist odor. Bamboo feels lighter during high-sweat sessions; merino stays fresher afterward. If you go straight from training to the rest of your day, merino wins.
Which is more sustainable? Both are strong choices. Bamboo regenerates from its own roots without irrigation or pesticides. Our merino blend pairs responsibly farmed wool with TENCEL lyocell, which is produced in a closed loop from sustainably grown trees. Neither sheds microplastics, unlike polyester.
Can I wear merino in summer? Yes. Merino releases heat and manages moisture vapor better than cotton or polyester. It is not as airy as bamboo in peak heat, but it is far from a winter-only fabric.
Browse both fabrics: the Apparel collection for bamboo and the Merino collection for the blend. To go deeper on the blend itself, read what is a merino wool and TENCEL blend.