1) Which size fits me?

    Sub45 and Sub90 come in 2 sizes: XS-S and M-L-XL.  To find yours, measure 2 inches below the pectoral muscles/ band line. See how to measure here.  If you are in between, consider thickness variations (jacket, etc.) between summer and winter runs.

    • XS/S =  26 to 31 in (67 to 78 cm)
    • M/L/XL = 31 to 40 in (78 to 102 cm)
    Sub180 has one size: XS to XL (24 to 48 in - 60 to 121.5 cm). Always adjust the sides first, then the bottom chest strap, then the upper chest strap. cm).

    2) How do I adjust my FITLY?

      It is worth spending 30 seconds to properly adjust FITLY to your body shape.  FITLY was developed specifically to reach a very high comfort level.  If your FITLY is not fitted properly, you will lose one of its key benefit. 

      • Sub45/Sub90: If the thoracic belt is too loose, the retraction force of the elastic band will be weaker, and items may shift.  Too tight and you may feel uneasy. Position the thoracic belt 2 inches below your pectoral muscle / band line. 
      • Sub180: First, adjust the 2 side straps, then the bottom chest strap and finish up with the upper chest strap. 

      Tip: it should feel snug, not tight.


      3) IMPORTANT: maintain your zippers?

      You go through a lot when you run.  Your zippers too!  With proper maintenance, they’ll perform for decades. Without, they may lock up.  Read the blog that explains how to care for your zippers.  You’ll be thankful you did!


      4) How do I wash my FITLY?

      Wash with mild soap. Rinse with lukewarm water. Many runners take FITLY with them in the shower post workout, rinse and hang upside down top dry.  Do not use your washing machine, it will rub the water-resistant coating off.  Insert some paper towel in the pockets to speed the drying process up if you need to. 

      5) How does the hydration system work?

      In all cases, rinse all flasks/ladders thoroughly before the first use. Dissolve some baking sodas and soak for 15 min if you experience a taste in the liquid.

      • The Sub90 comes with an integrated hydration system. Suction creates a vacuum pulling the liquid out, not gravity. Having a tight seal is important.  Make sure the attachment to the flask is tightly fastened.  If not properly screwed on, air can seep through and you won't be able to drink the whole volume. Use natural oil (like olive oil) on the flask’s thread and screw cap to increase the seal.  The mouthpiece at the end of the tube has a liquid flow stopper.  Twist to open or simply pull.
      • The Sub180 comes with a bladder.  Unlike Sub90 where the end of the tube is cut right after the screw cap. Thread the mouthpiece from the upper corner of the bladder pocket through the shoulder straps and attach it to the tube holders. Do not insert the tube all the way to the bottom of the bladder: always leave 0.4 in - 1cm or the TPU will block the liquid from entering into the tube. Proper sealing is important so fasten the tube tightly to the bladder.

      Tip: Dry the flask upside down. Insert a wooden spoon (or similar object) to enable air circulation inside the flask.

      6) I try to drink and nothing comes out, what am I doing wrong?

      Your flow stop is probably on, preventing the liquid to pass through. Please watch this quick video explaining what to do: FLOW STOP

      Also, if you insert the tube too far inside the flask, the TPU can block the flow.  

      7) Where can I store which flasks?

      -F1 fits in the front pockets of all FITLY, except the Sub90 XS-S when filled completely.

      -F2, F3, F4 and F5L fit in the back pockets of any FITLY and the upper front pocket of the Sub180.

      -F5 and F5B comes with every Sub90 and fits right in the custom made thermo-pocket. F5/F5B does not fit in the Sub45

      -F11 comes with every Sub180 and fits right in the custom made thermo-pocket. F11 does not fit in the Sub90 nor the Sub45

      -F17 is a stand alone flask and bladder system to use with your own pack or the Sub180.  

      You could use any flask with the tubing system as they all share the same system. Note that the Sub45 is designed structurally to hold a certain weight.  If you overpack it, you will experience some bouncing at the front straps level.

      8) The water in the flask seems to have a taste, how do I get rid of it?

      Always RINSE before first use. Mix a teaspoon of BAKING SODA with lukewarm water, let soak for 15 min, rinse.

      Users have also found the following to be useful:

      1. Fill with MILK, shake, and rinse
      2. Add drops of LEMON
      3. Let an ORANGE PEEL or a TEA BAG sit in the flask for a couple of hours

      Note: TPU material has been used in millions of products for decades. Our flasks passed the Sensorial Examination for Odor and Taste (Robinson’s test) with a 0/2.5, indicating “no perceptible odor”.  In other words, no particle transfer can be found in the liquid after 5 hours at 50°C/122°F. 


      Find the right band size