POLYESTER IS PLASTIC. START WITH THE LABEL.

YOU LOOK AFTER EVERYTHING.WHAT ABOUTYOUR NUTS?

Food labels. Gym sessions. Supplements. What about the layer you wear all day? Eight questions to spot the fabric, fit and heat habits you may have overlooked. Then five optional questions to personalise your next step and help shape what we build.
Thinking about future fatherhood? Give your everyday habits a closer look.

What matters most to you?

Optional. This changes the advice you see, not your score. Your choice stays on this device.

8 quick questions + 5 optional · Email and research optional

01See what stacks up in your day02Find your biggest reported contributors03Get a practical next step + founder offer

This is a guide to everyday habits, not a test of sperm quality, body temperature or fertility.

Campaign visualisation of the NumbNuts boxer and two branded cooling inserts
YOUR DAY. DECODED.
Product visualisation, not temperature evidence.

FIND YOUR FIT

Size guide

Use your waist measurement. Between sizes? Size up.

SizeInchescm
S28-3071-76
M32-3481-86
L36-3891-97
XL40-42102-107
XXL44-46112-117