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 Whey Protein Tub - 1kg
    +4Flavours
    SiS Whey Protein Tub - 1kg
    Save 25%
    Special Price £22.50 Was £30.00
    62 Reviews
  2. SiS PLANT20 Bar - 64g
    +3Flavours
  3. SiS PROTEIN20 - 12 Pack
    +3Flavours
    SiS PROTEIN20 - 12 Pack
    Save 30%
    Special Price £21.00 Was £30.00
    30 Reviews
  4. SiS PROTEIN20 Bar Bundle
    SiS PROTEIN20 Bar Bundle
    Save 30%
    Was £15.00 £10.50
    0 Reviews
  5. SiS Whey Power - 1kg
    +3Flavours
    SiS Whey Power - 1kg
    Save 60%
    Special Price £12.00 Was £30.00
    6 Reviews
  6. SiS PROTEIN20 - 12 Pack (Vanilla Cheesecake)
    SiS PROTEIN20 - 12 Pack (Vanilla Cheesecake)
    Save 60%
    Special Price £12.00 Was £30.00
    13 Reviews
  7. SiS PROTEIN20 - 55g
    +3Flavours
  8. SiS Overnight Protein Powder - 1kg
    +3Flavours
    SiS Overnight Protein Powder - 1kg
    Save 25%
    Special Price £36.00 Was £48.00
    19 Reviews
  9. SiS WHEY20 Gel - 12 pack
    +7Flavours
  10. SIS Whey 20 Gel - 78ml
    +5Flavours
  11. SiS Protein Bar - 55g
    +2Flavours
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