Mail-in sweat analysis · single conditionThe Test Kit
Test the sweat you lose in a real effort — turned into the sodium number you fuel against, and a race-day plan you can follow.
$129.00vs $175.00 in-person sweat analysis
Free shipping both ways. One test, complete results. Usable result, or your money back.
Science shown, not hidden In the box2 forearm collection pads
Medical-grade adhesive + absorbent pad, one per arm
QR-coded collection bag
Links the kit to your account in one scan
Prepaid return label
Drop it in any mailbox — we cover the postage
Step-by-step instruction card
The weigh-in protocol that makes the numbers real
What you get backThe one number that drives every fueling decision.
Sodium loss rate, sweat rate, and total loss — always tied to the effort they were measured in, never a naked figure.
What you get backMeasured
Sodium loss rate
1,320mg Na/hr
measured during a long, hot training effort
No house electrolyte. Ever.We tell you what to replace — then point you at whatever you can actually get.
SkratchLMNTMaurtenTailwindPrecision