These tubes hold up much better than standard tubes when it comes to pinch flats, and because of their inherent thickness they allow you to run them with higher air pressure in places with rocks. MSR offers their branding and assurance that these are quality items. Heavy Duty Tubes and Ultra Heavy Duty Tubes are made of natural rubber and provide up to 3 times the thickness of Standard Tubes
For our recommendation on Tubes for different types of riding:
Standard Tube: Supercross and Motocross
Heavy Duty Tubes: Amateur & Supercross and Motocross and Weekend Warrior Riding
Ultra Heavy Duty Tubes: Best for Enduro and Desert Riding.