HOW TO FIT
HIKING BOOTS
5 Rules to Stop Blisters & Black Toenails
WMS research shows 74% of hikers buy wrong sizes. Follow 5 rules for blister-free miles.
NEVER SIZE
IN MORNING
Feet expand 4-8% by 4 PM. Measure late with trail socks, then size up +0.5 to +1.0 full size.
THE 12-15MM
RULE
Downhill gravity adds 2.5x bodyweight. APMA guidance requires a full finger gap behind your heel.
WIDTH VS
VOLUME
Width is forefoot splay; volume is instep height. Never upsize length to fix a tight width.
LOCK YOUR
HEEL
Heel lift over 5mm shreds skin. Tie a double-overhand friction knot at the ankle bend to lock it.
THE 3-KICK
TEST
1. Kick baseboard 3x: Toes must never hit front.
2. Walk downhill ramp: Zero heel slip or toe strike.
FIND YOUR
EXACT SIZE
Convert foot mm to US, UK, & EU sizes with built-in trail swelling compensation.