Feetures Elite Light Cushion NST Boulder Blue Size:Large (UK 8-11) That's where the Active-T Flow

That's where the Active-T Flow gets its name

once closed

Taking on a billowed effect

Pair with the CRUX™ reservoir on/off valve (sold separately) for 20% more water flow per sip

with space through the midfoot

Feetures Elite Light Cushion NST Boulder Blue Size:Large (UK 8-11) That's where the Active-T FlowOur most technically advanced sock. Designed around our patented Targeted Compression for superior comfort and support plus Ultra Light cushioning that takes up minimal room inside the shoe. Patented Sock Lock Technology to provide targeted compression where its needed most. Anatomical design enhances fit, delivering maximum comfort and protection by eliminating blisters. Ultra thin construction takes up minimal room inside the shoe. No Show Tab