If you're looking for umpire shin guards with lower thigh protection and solid features at a reasonable price, the Diamond iX3 with its triple-knee design and top-quality manufacturing is one to consider.  Comes in three different sizes – 15.5, 17, and 18.5.

• iX3 lightweight padding
• Additional hinged cap above the knee provides lower thigh protection.
• Floating lower knee cap for better flex upon bending
• Inner padding extends enough around the leg to prevent rubbing from strap hooks.
• Extended ankle protection is a layer of fabric over hard plastic inserts for stronger protection.
• Instep guard is secured by Velcro making it easily removable if wearing plate shoes.
• Weight:15.5"-1.14lbs, 17"-2.2lbs, 18.5"-2.24lbs
• Locking J-hooks to help prevent detachment during game