S1
Conforms to EN ISO 20345:2011
S1 in addition to 200 joule toe cap, is classed as antistatic footwear the sole is also resistant to fuel oil and has energy absorption in the heel area.

S1-P
Conforms to EN ISO 20345:2011
S1-P has the same features as the S1 rating with the addition of the midsole penetration protection this can be a stainless steel insert in the sole, aluminium insert in the sole or by Kevlar insole.