S1 Mini Lifer Helmet 

fits head sizes 18.5 - 20.5

Hat Size 5/78" or  Head Measures 18.5" Circumference  = X-Small ( Grey Liners)

Hat Size 6" or  Head Measures 19" Circumference = Small  (Red Liners) 

Hat Size 6 1/4" or Head Measures 19.5" Circumference = Medium (Beige Liners) 

Hat Size 6 3/8" or  Head Measures 20" Circumference = Large (Black Liners) 

Hat Size 6 1/2" or  Head Measures 20.5" Circumference = X-Large (Green Liners)  

S1 Lifer Helmet

fits head sizes 20.5 - 23.5

Hat Size 6 1/2" or  Head Measures 20.5" Circumference  = X-Small ( Grey Liners)

Hat Size 6 5/8" or  Head Measures 21" Circumference = Small  (Red Liners) 

Hat Size 6 7/8" or Head Measures 21.5" Circumference = Medium (Beige Liners) 

Hat Size 7" or  Head Measures 22" Circumference = Large (Black Liners) 

Hat Size 7 1/8" or  Head Measures 22.5" Circumference = X-Large (Green Liners)  

Hat Size 7 1/2" or Head Measures 23.5" Circumference = 2 Xlarge (Blue Liners) 

S1 Mega Lifer Helmet

fits head sizes 23" - 25.5"

Hat Size 7 1/4" or  Head Measures 23" Circumference = Small  (Red Liners) 

Hat Size 7 1/2" or Head Measures 23.5" Circumference = Medium (Beige Liners) 

Hat Size 7 5/8" or  Head Measures 24" Circumference = Large (Black Liners) 

Hat Size 7 3/4" or  Head Measures 24.5" Circumference = X-Large (Green Liners)  

Hat Size 8" or Head Measures 25" Circumference = 2 Xlarge (Blue Liners) 

CPSC Certified

S1 Lifer Helmets / Skate + Bike + Ebike (Class 1 & 2)

Photo: Eric Dressen, Wyatt Hammond, Christian Hosoi, Lance Mountain, Boyd Hilder, Chase Hawk, Oneway Lilman, Murf Electric Bikes 

S1 Helmets #s1helmets