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 - 55g
    +3Flavours
  2. SiS Overnight Protein Powder - 1kg
    +3Flavours
    SiS Overnight Protein Powder - 1kg
    33% Off
    Was £48.00 Special Price £32.00
    12 Reviews
  3. SiS Advanced Isolate+ Protein Powder - 1kg
    +2Flavours
    SiS Advanced Isolate+ Protein Powder - 1kg
    27% Off
    Was £45.00 Special Price £33.00
    15 Reviews
  4. SiS WHEY20 Gel - 12 pack
    +7Flavours
    SiS WHEY20 Gel - 12 pack
    35% Off
    Was £27.50 Special Price £18.00
    21 Reviews
  5. SIS WHEY20 Gel - 4-pack
    +2Flavours
    SIS WHEY20 Gel - 4-pack
    33% Off
    Was £9.00 Special Price £6.00
    22 Reviews
    Out of stock
  6. SiS Protein Bar - 55g
    +2Flavours
  7. SiS Whey Protein Bundle
    SiS Whey Protein Bundle
    33% Off
    Was £66.00 £44.00
    0 Reviews
  8. SiS PROTEIN20 Bar Bundle
    SiS PROTEIN20 Bar Bundle
    36% Off
    Was £15.00 £9.60
    0 Reviews
  9. PLANT20 Bar Bundle
    PLANT20 Bar Bundle
    30% Off
    Was £15.00 £10.50
    0 Reviews
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