Presta Valve. We take pride in supporting grassroots sport whenever we can and are proud to support a number of up and coming athletes. Provides flat tire protection for up to 2 years. XXS - 6 | XS - 8 | S - 10 | M - 12 | L - 14 | XL - 16 | 2XL - 18 | 3XL - 20 | 4XL - 22.