"Khao Sam Muk is the landmark of Bang Saen — witness to every race, every runner who has pushed against its steepness. The pattern is a direct Topographic Map of the mountain. Every contour line is a real geographic trace — both decorative and structural, worn on the body. When runners wear this, they are not just racing — they are carrying the mountain, proving they are strong enough to conquer it.

""บ"" from บางแสน · ""B"" from Bang Saen — two letters forming one Family Emblem, representing the legacy and continuity of Bang Saen racing. This mark appears across all three editions — Bang Saen 10, 21, and 42 — connecting every runner, every distance, under one name and one purpose."

• Seamless full-body construction with Bonding technology enhances overall comfort while reducing friction during movement.
  
• Laser-cut perforations on both the front and back panels help reduce fabric weight while delivering excellent breathability and ventilation.
  
• The specially widened hem design provides greater freedom of movement, supporting smooth and unrestricted motion throughout every run.
  
• Finished with reflective heat-transfer detailing to enhance visibility in low-light conditions.