PRIMO are the next level in size 18-21 (UK 1.5 to 4.5) which offer:
Very soft anti slip soles for better steadiness and balance,
Anatomic breathable insoles made of active carbon which is breathable, absorbent and anti bacterial,
Protective hardened material that keeps the shape of the shoe and holds the foot at the right position,
Elevated back side and / or soft cushion for better support, comfortable fit and protection of the ankle bone.
EXCLUSIVE are from size 21 to 25 and have an extra special detail or design. They include all the design details above and also:
Elevated heel and / or soft cushion for better support, comfortable fit and protection of the ankle bone.
Reinforcing material that protects toes from impact