Crisphead or iceberg, is a rounded, compact lettuce with overlapping leaves. The interior leaves are paler and sweet, while the exterior, greener leaves are more malleable and useful for lettuce wraps. The plants need a long, cool season to develop the dense heads. Iceberg lettuce, also known as crisphead, has long been a popular type of lettuce sold in the United States. It is characterized by a tight head of crisp, light green leaves. A crispy texture and neutral taste have made iceberg lettuce a popular addition to salad mixes, as it counterbalances the bitterness of many other types of lettuces. Crisphead lettuce seed is a category that includes lettuces like Batavian and iceberg types. These lettuces are crunchy, juicy and usually form a head when mature. Crisp type lettuces are relatively tolerant of hot weather and slower to bolt than other lettuce types. An excellent heading lettuce producing compact med-large heads, crisp hearts, light green leaves with waxy bronze fringe.