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Ultimate Performance Tee

Ultimate Performance Tee

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£16.99
£19.99 £16.99
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    Ultimate Performance Tee

    Black / S

    UK Size EU Size US Size Chest (cm) Chest (in) Waist (cm) Waist (in) Hip (cm) Hip (in)
    6 34 2 79-83 31-32.5 61-65 24-25.5 86-90 34-35.5
    8 36 4 84-88 33-34.5 66-70 26-27.5 91-95 36-37.5
    10 38 6 89-93 35-36.5 71-75 28-29.5 96-100 38-39.5
    12 40 8 94-98 37-38.5 76-80 30-31.5 101-105 40-41.5
    14 42 10 99-104 39-41 81-86 32-34 106-111 42-43.5
    16 44 12 105-110 41.5-43.5 87-92 34.5-36 112-117 44-46
    UK Size EU Size US Size Waist (cm) Waist (in) Hip (cm) Hip (in)
    6 34 2 61-65 24-25.5 86-90 34-35.5
    8 36 4 66-70 26-27.5 91-95 36-37.5
    10 38 6 71-75 28-29.5 96-100 38-39.5
    12 40 8 76-80 30-31.5 101-105 40-41.5
    14 42 10 81-86 32-34 106-111 42-43.5
    16 44 12 87-92 34.5-36 112-117 44-46
    UK Size EU Size US Size Chest (cm) Chest (in) Waist (cm) Waist (in) Hip (cm) Hip (in)
    6 34 2 79-83 31-32.5 61-65 24-25.5 86-90 34-35.5
    8 36 4 84-88 33-34.5 66-70 26-27.5 91-95 36-37.5
    10 38 6 89-93 35-36.5 71-75 28-29.5 96-100 38-39.5
    12 40 8 94-98 37-38.5 76-80 30-31.5 101-105 40-41.5
    14 42 10 99-104 39-41 81-86 32-34 106-111 42-43.5
    16 44 12 105-110 41.5-43.5 87-92 34.5-36 112-117 44-46
    Size Chest (inches) Underbust (inches)
    XS 33⅛ 27½
    S 34⅝ 29⅛
    M 36¼ 30¾
    L 39⅜ 33½
    XL 42½ 36¼
    2XL 45⅝ 39
    3XL 48⅞ 41¾
    UK Size EU Size US Size Chest (cm) Chest (in) Waist (cm) Waist (in)
    XS 44 34 86-91 34-36 71-76 28-30
    S 46 36 91-97 36-38 76-81 30-32
    M 48 38 97-102 38-40 81-86 32-34
    L 50 40 102-107 40-42 86-91 34-36
    XL 52 42 107-112 42-44 91-97 36-38
    2XL 54 44 112-117 44-46 97-102 38-40
    UK Size EU Size US Size Waist (cm) Waist (in) Hip (cm) Hip (in)
    XS 44 34 71-76 28-30 86-91 34-36
    S 46 36 76-81 30-32 91-97 36-38
    M 48 38 81-86 32-34 97-102 38-40
    L 50 40 86-91 34-36 102-107 40-42
    XL 52 42 91-97 36-38 107-112 42-44
    2XL 54 44 97-102 38-40 112-117 44-46
    EU Size UK Size US Size
    35 2.5 5
    36 3.5 6
    37 4 6.5
    38 5 7.5
    39 6 8.5
    40 6.5 9
    41 7.5 10
    EU Size UK Size US Size
    35 2.5 5
    36 3.5 6
    37 4 6.5
    38 5 7.5
    39 6 8.5
    40 6.5 9
    41 7.5 10
    How to measure: For the most accurate fit, measure yourself in your underwear. Use a soft measuring tape and keep it snug but not tight. For chest measurements, measure around the fullest part of your bust. For waist, measure around the narrowest part. For hips, measure around the fullest part. For sports bras, measure your underbust directly under your bust where the band sits.

    GymBum UK – Ultimate Performance Tee

    Built for movement and engineered for everyday performance, the Ultimate Performance Tee delivers lightweight comfort with the durability needed for serious training. Constructed from breathable polyester mesh, it allows air to circulate freely while helping regulate body temperature during intense workouts.

    QuickDry moisture-wicking fabric helps pull sweat away from the skin, keeping you cool, dry, and focused whether you're pushing through high-intensity training or staying active throughout the day.

    The relaxed athletic fit provides unrestricted movement, while the extended length ensures reliable coverage during lifts, squats, and dynamic training. Lightweight yet durable, this tee is designed to maintain its shape and colour through repeated training sessions and washes.

    Finished with clean GymBum styling and performance-driven construction, the Ultimate Performance Tee delivers the balance of comfort, durability, and athletic performance expected from premium training apparel.

    Reach for the Summit.

    Why You'll Love It

    • Breathable polyester mesh helps regulate body temperature during workouts
    • QuickDry moisture-wicking fabric keeps you cool and comfortable
    • Relaxed athletic fit for unrestricted movement
    • Extended length for better coverage during lifts and training
    • Lightweight construction designed for all-day comfort
    • Durable fabric built to maintain shape and colour over time

    Performance Fabric

    • 100% breathable polyester mesh
    • Fabric weight: 4.13 oz./yd²
    • Lightweight performance construction
    • QuickDry moisture-wicking technology

    Construction Details

    • Side-seamed construction for improved durability
    • Reinforced collar binding for long-lasting structure
    • Short raglan sleeves for enhanced shoulder mobility
    • Classic round neckline for versatile everyday wear

    Performance & Fit

    The Ultimate Performance Tee features a relaxed athletic fit that moves naturally with your body. Raglan sleeves allow full shoulder mobility, making it ideal for lifting, functional fitness, and dynamic training movements.

    The extended length provides reliable coverage during squats, presses, and overhead exercises.

    Designed For

    • Strength training
    • Cross training & HIIT
    • Running & cardio
    • Functional fitness
    • Everyday activewear

    GymBum Performance Standard

    Every GymBum product is designed with a balance of performance, durability, and clean athletic styling.

    Our goal is simple: create premium activewear that performs in the gym while remaining comfortable enough for everyday wear.

    Reach for the Summit.




    Size guide

      LENGTH (inches) CHEST (inches)
    S 27 ½ 31-34
    M 28 ⅜ 35-38
    L 29 ⅛ 39-41
    XL 29 ⅞ 42-45
    2XL 30 ¾ 46-48
      LENGTH (cm) CHEST (cm)
    S 70 78.7-86.4
    M 72 89-96.5
    L 74 99-104.1
    XL 76 106.7-114.3
    2XL 78 116.8-122

    Frequently Asked Questions

    Find answers to common questions about our products

    • Our products are crafted from premium, moisture-wicking fabrics designed for maximum performance and comfort during your workouts.

    • Please refer to our detailed size guide available on each product page. We recommend measuring yourself and comparing to our size chart for the best fit.

    • We offer a 30-day return policy on all unworn items with tags attached. Please visit our returns page for full details.

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