Forums Boots Deeluxe SPARK XV liners – which is best? Viewing 2 posts - 1 through 2 (of 2 total) Author Posts November 3, 2017 at 10:25 am #812152 solidbored 54 Posts Hi. There are three models of Spark XV, there is the TF (thermo flex), PF (performance flex) and the TPF (thermo premium flex). It is obvious the TPF is the best liner, but what about the TF and PF? Which one of these is better? I assumed the PF was better, but I am seeing that the TF is priced higher than PF on a lot of sites. November 26, 2017 at 4:39 pm #813298 Botero 36 Posts hi, off topic a bit but curious as how the deeluxe sparks run width wise? thanks Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.