Isopogon crithmifolius is a shrub that typically grows to a height of and has hairypale brownbranchlets. The leaves are long on a petiole long, divided into two or three lobes, the lobes often further divided. The flowers are arranged in more or less spherical, sessile heads long in diameter with egg-shapedinvolucral bracts at the base. The flowers are long, reddish pink and glabrous. Flowering occurs from September to October and the fruit is a hairy oval nut, fused with others in a spherical cone in diameter.