Michelin's Airstop name says it all. Their Airstop tubes use a proprietary butyl rubber that holds pressure longer so you won't have to top off your tires so much. These fine tubes are reinforced at the valve, too.
Weight: 166 grams
|700 x 35-47c (40mm Presta valve)||086699217363||21736|
|700 x 35-47c (Schrader valve)||086699856814||85681||12146|