The Alder Torch FX 4/3 is a high spec wetsuit that's perfect for shoulder season or winter actities with less exposure to water. 

Here's what Alder say: 

CONSTRUCTION
SEAMS: GLUED & BLINDSTITCHED
SEAMS: TAPED INSIDE STRESS AREAS
FABRIC: MAIN BODY - 4MM FLOFLEX NEOPRENE
FABRIC: ARMS/SHOULDERS - 3MM FX NEOPRENE
 
FEATURES
FIRELINE LINING INSIDE TORSO BACK & FRONT
DURATECH KNEE PADS
HIDDEN KEY LOOP
PK PLASTIC ZIP
AQUA ALPHA GLUE
DOUBLE LINED THROUGHOUT
“O” RINGS ON CUFFS AND ANKLES