X Ultra 4 Mid Winter TS CSWP - Mens May 31 The twist open cap is

The twist open cap is large enough to fit ice cubes and fill quickly

and since it's lightweight and waterproof

you can also access the Settings/Tag button to quickly change settings

Extremely packable the Alpha Flash boasts an impressive warmth to weight ratio

with the Jess Reversible One Piece

X Ultra 4 Mid Winter TS CSWP - Mens May 31 The twist open cap isDesigned to power through uphills and descents, the X ULTRA is now available in an all winter version. Just as agile as a trail running shoe, it offers all the stability, grip and protective comfort you need to tackle wintery terrain and cold temperatures. Not to mention cozy 3M Thinsulate insulation.