Protein

Protein is essential for endurance athletes, to ensure your muscles are rebuilt after your activity. Protein products are designed to suit every goal and budget, including Whey Protein, our premium Whey Protein Advanced Isolate +, great tasting Overnight Protein, delicious Protein Bars and the biggest innovation in protein for years – WHEY20. All available in a wide range of sizes and flavours!

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  1. SiS PROTEIN20 - 12 Pack
    +3Flavours
    SiS PROTEIN20 - 12 Pack
    Save 40%
    Special Price £18.00 Was £30.00
    54 Reviews
  2. SiS PLANT20 Vegan Protein Bar Bar - 12 Pack
    +3Flavours
    SiS PLANT20 Vegan Protein Bar Bar - 12 Pack
    Save 70%
    Special Price £9.00 Was £30.00
    57 Reviews
  3. SiS Whey Protein Tub - 1kg
    +4Flavours
    SiS Whey Protein Tub - 1kg
    Save 40%
    Special Price £18.00 Was £30.00
    65 Reviews
  4. SiS PROTEIN20 Bar Bundle
    SiS PROTEIN20 Bar Bundle
    Save 40%
    Was £15.00 £9.00
    1 Reviews
  5. SiS PROTEIN20 - 55g
    +3Flavours
    SiS PROTEIN20 - 55g
    Save 40%
    Special Price £1.50 Was £2.50
    30 Reviews
  6. SiS Recovery Bundle
    SiS Recovery Bundle
    Save 40%
    Was £122.00 £73.20
    0 Reviews
    Out of stock
  7. SiS PLANT20 Bar - 64g
    +3Flavours
    SiS PLANT20 Bar - 64g
    Save 40%
    Special Price £1.50 Was £2.50
    12 Reviews
  8. SiS Protein Bar - 55g
    +2Flavours
    SiS Protein Bar - 55g
    Save 40%
    Special Price £1.50 Was £2.50
    39 Reviews
    Out of stock
  9. SiS Whey Protein Bundle
    SiS Whey Protein Bundle
    Save 40%
    Was £66.00 £39.60
    0 Reviews
    Out of stock
  10. SiS Advanced Isolate+ Protein Powder - 1kg
    +2Flavours
    SiS Advanced Isolate+ Protein Powder - 1kg
    Save 40%
    Special Price £27.00 Was £45.00
    29 Reviews
    Out of stock
  11. 700ml SiS Protein Shaker
    SiS Shaker Bottle - 700ml
    Save 40%
    Special Price £3.00 Was £5.00
    20 Reviews
    Out of stock
  12. PNG
    SiS Protein Bar Bundle
    Save 40%
    Was £12.00 £7.20
    2 Reviews
    Out of stock
  13. SiS PLANT20 Bar Bundle
    SiS PLANT20 Bar Bundle
    Save 60%
    Was £15.00 £6.00
    2 Reviews
  14. SIS GO Energy + Protein Bar - 60g
    +3Flavours
    SIS GO Energy + Protein Bar - 60g
    Save 40%
    Special Price £0.90 Was £1.50
    15 Reviews
    Out of stock
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