Scorpion EXO-10-603-60 Exo-R1 Air Motorcycle Helmet Liner Set Black
S$55.00
or 3 installments of S$18.33 with 
or 3 installments of S$18.33 with
There are 2 reasons why you might want to replace the interior of a helmet:
With wear, the cheek pads and center pad become thinner, losing their resilience. If the interior has become too thin, your helmet will become looser, with uncomfortable consequences.