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    Home / All / Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank
    Core Muscle Tank

    Core Muscle Tank

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    STYLED ON INSTA

    Our humble classic muscle tank just got a face lift. Our updated fit skims the body in the right places and the slimmer fit over the shoulder makes for a flattering cut. This totally versatile classic will have your cost per wear at an all time low - working effortlessly across your active and off duty wardrobe you'll find 101 ways and places to wear this tank.
    • 100% Certified Organic Cotton
    • Self fabric neck band
    • Relaxed fit
    • Ethically produced
    • Model wears a size 1 and is 176cm tall


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    2025 First Base Sydney. All rights reserved.

    Size chart

    First Base 0 1 2 3 4
    Universal XS S M L XL
    Australia 6 8 10 12 14
    USA 2 4 6 8 9
    United Kingdom 6 8 10 12 13
    Italy 38 40 42 44 45
    France 34 36 38 40 41

    Fit Guide

    First Base 0 1 2 3 4
    metric (centimeters)
    Bust    		 77-81 82-86 87-91 92-96 97-101
    Waist 63-67 68-72 73-77 78-82 83-87
    Hips 82-86 87-91 92-96 97-101 102-106

    General fit

    FIRST BASE GARMENTS (TEES, BOTTOMS, DRESSES AND OUTERWEAR) ARE DESIGNED ON THE SLOUCHY SIDE

    AND ARE MADE TO BE WORN OVERSIZED. WE WOULD ADVISE YOU GO DOWN A SIZE IF YOU PREFER A FITTED LOOK.

    FIRST BASE ACTIVEWEAR IS TRUE TO SIZE AND ARE DESIGNED TO BE WORN TIGHT TO THE BODY.

    OUR DESIGNERS AND GARMENT TECHS ENSURE THAT EVERY GARMENT CORRESPONDS TO OUR SIZING CHARTS, SO THAT YOU CAN SHOP ONLINE WITH CONFIDENCE. PLEASE TAKE A MOMENT TO MEASURE YOURSELF TO HELP SELECT THE BEST FIRST BASE SIZE FOR YOU. NO TAPE MEASURE AND NO IDEA? NO WORRIES -

    DROP US AN EMAIL CUSTOMER.CARE@THISISFIRSTBASE.COM AND WE CAN TOTALLY HELP GET YOU SORTED.