The perfect blend of that desirable `barefoot`sensation and unrivaled warmth, an external split-toe and ultra-thin rubber layup is incorporated into its 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.