2.3 Rider Equipment and Attire

Helmet: ASTM/SEI F1163, PAS 015, EN 1384 (or successor standard) certified riding helmet mandatory at all times when mounted. Chin strap must be fastened. No modifications to the helmet shell.; Dressage attire: Shadbelly (tailcoat) or short jacket, white or light-colored breeches, tall black boot...

Send this to your friend — argument over.