Abstract: A protective sleeve assembly for a javelin, particularly for a competition or training javelin, including an outer sleeve made of an elastic material, and an inner sleeve which is located a socket axially provided in the outer sleeve. The inner sleeve has a recess which is intended to receive a forward part of a javelin tip. The outer sleeve has a tubular axially trailing part, the inner diameter of which is such as to obtain an elastic, squeeze fit around a rear part of the javelin tip. The outer sleeve has an internal recess which accommodates the inner sleeve. Similar to the forward end of the inner sleeve, the forward end of the outer sleeve is also of externally, frontally hemispherical shape. The inner sleeve is located in the axially leading part of the outer sleeve. The protective sleeve assembly can contribute to safety, by reducing the risk of serious injury to persons in conjunction with javelin-throwing exercises.