Vaporesso have included their SSS Leak-resistant technology inside the XROS pods, to lock the e-liquid inside and prevent any leakage. XROS 0.4 Pods. All five XROS pod options are designed for use with both Freebase and Nic Salt e-liquids, with the 0.4Ω and 0.6Ω pods being designed to provide a sweeter experience with freebase e-liquids.