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.
|Option||Barcode||Manufacturer's Part Number||Vendor Number|
|700 x 35-47c (40mm Presta valve)||00086699217363||21736||QBP-TU8141|
|700 x 35-47c (Schrader valve)||00086699856814||85681||QBP-TU8140|