Abstract: A fiber includes at least a first portion extending axially and including a shear thickening fluid. The fiber further includes at least a second portion extending radially outwardly from the first portion. The second portion extends axially and radially encompasses the first portion over a length thereof. The shear thickening fluid may, for example, include particles suspended in a liquid phase. The second portion may, for example, include an abrasion resistant material. The fiber may further include at least a third portion extending axially and positioned radially inward of the first portion. The third portion may, for example, include a material having a higher strength than the second portion.