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Welcome to the inner circle of tree nerdery. The Sap Flow Society long sleeve blends arbor-culture™ with actual culture — a vintage science-lab motif that nods to xylem under pressure, phloem under purpose, and the shared obsession with what’s happening beneath the bark.
Designed for the ones who see more than just a tree line — they see function, hydraulics, and life moving upward. Perfect for climbers, scientists, PHC techs, or anyone whose idea of “lab work” involves soil, cambium, and a rope bag.
Soft, durable, and cape-cod-approved for shoulder-season weather. Wear it to the jobsite, to class, or to your next quiet flex among the botanically literate.
If you know, you know.
Age restrictions: For adults
EU Warranty: 2 years
Other compliance information: Meets the EU REACH requirements.
In compliance with the General Product Safety Regulation (GPSR), Knotty Intentions and SINDEN VENTURES LIMITED ensure that all consumer products offered are safe and meet EU standards. For any product safety related inquiries or concerns, please contact our EU representative at gpsr@sindenventures.com. You can also write to us at PO Box 371
Dennis, MA 02638 or Markou Evgenikou 11, Mesa Geitonia, 4002, Limassol, Cyprus.
Sap Flow Society – Long Sleeve
$18.75
Reliable shipping
Flexible returns
Designed for the ones who see more than just a tree line — they see function, hydraulics, and life moving upward. Perfect for climbers, scientists, PHC techs, or anyone whose idea of “lab work” involves soil, cambium, and a rope bag.
Soft, durable, and cape-cod-approved for shoulder-season weather. Wear it to the jobsite, to class, or to your next quiet flex among the botanically literate.
If you know, you know.
Age restrictions: For adults
EU Warranty: 2 years
Other compliance information: Meets the EU REACH requirements.
In compliance with the General Product Safety Regulation (GPSR), Knotty Intentions and SINDEN VENTURES LIMITED ensure that all consumer products offered are safe and meet EU standards. For any product safety related inquiries or concerns, please contact our EU representative at gpsr@sindenventures.com. You can also write to us at PO Box 371
Dennis, MA 02638 or Markou Evgenikou 11, Mesa Geitonia, 4002, Limassol, Cyprus.
Size guide
| LENGTH (inches) | WIDTH (inches) | |
| S | 28 | 18 |
| M | 29 | 20 |
| L | 30 | 22 |
| XL | 31 | 24 |
| 2XL | 32 | 26 |
| LENGTH (cm) | WIDTH (cm) | |
| S | 71.1 | 45.7 |
| M | 73.7 | 50.8 |
| L | 76.2 | 55.9 |
| XL | 78.7 | 61 |
| 2XL | 81.3 | 66 |