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The Sykes AT in Airtastic has an overall weight that is 40% lighter than the Sykes PX in Primeflex. Size Medium is 2.7 oz / 76.5 g in Sykes AT vs 4.8 oz / 136 g for Sykes PX.
Airtastic fabric has less stretch than PrimeFlex, so it doesn't stretch as much. The phone pocket accommodat