The perfect blend of that desirable `barefoot`sensation and unrivalled warmth, an external split-toe and ultra-thin rubber layup is incorporated into ist forward-thinking design. All of the magma styles have the following standard features: Ankle Strap: stay secure and supported. Segmented sole: creative and strategic cuttings have been integrated into the sole to enhance the flexibility in critical areas of the foot. Last Construction: ES = External Split – since the beginning used at the ballistic toes. RT – for those who don´t like that string between your toes we offer a round toe no-split version.