High performance 3.5mm neoprene is used for the deck and the tunnel (body circumference), and a 3/8 inch bungee rim is used.

●Material: High performance neoprene ●Cockpit size
1.2: 85cm x 45cm
1.4: 87cm x 48cm
1.7: 91cm x 52cm
2.2: 95cm x 56cm
K1: 72cm x 43cm
K1 Large: 78cm x 44cm
K1 X-Large: 85cm x 46cm

●Waist size
XS size: 24"-26" (60.96-66.04cm)
S size: 27 inches to 29 inches (68.58 to 73.66 cm)
Medium: 30 inches to 32 inches (76.2 to 81.28 cm)
Large: 33 inches to 35 inches (83.82 to 88.9 cm)
XL size: 36 inches to 38 inches (91.44 to 96.52 cm)