Schroth is the brand to have for safety and peace of mind motoring. The Schroth range of 4 point harnesses come with asm! This safety feature is a tradmark of Schroth, and the reason we recommened them so highly as apposed to other brands!

asm®
The patented SCHROTH asm® system offers an unique safety advantage for 4-point harnesses. asm® is the acronym for anti submarining. The risk to submarine (sliding underneath the lap belt), a well known phenomenon during frontal impacts, is significantly reduced by the asm® safety system. The energy converter is located in the inboard shoulder belt. Therefore make sure you purchase left and/or right harnesses.
Severe injuries or death are possible using 4-point harnesses without the SCHROTH asm® safety system or an anti-sub strap. SCHROTH harnesses designed for use on public roads (FE push button models) or those likely to be used as 4-points come with the asm® safety system. The performance of the SCHROTH asm® safety system has also been positively tested in conjunction with airbags. Current Head And Neck Supports (HANS®) provide further reduction of head deceleration and neck injury. All SCHROTH racing models likely to be used with any head and neck devices come without the asm® system.
Racing harnesses without asm® must be worn with an anti-sub strap!